Words and expressions
cube n.[c] solid shape with six square sides 块；立方形
He bought a jin of cube sugar yesterday. 他昨天买了一斤方糖。
sailor n. someone who helps to control a boat or ship船员；水手；水兵
The sailors landed on Dalian. 海员在大连上岸。
mariner n.[c] <书>船员；水手 (=sailor)
benefit vt. help someone or something; make someone better, happier, etc.获益；对…有利；使……受益
The fresh air will benefit you. 新鲜空气对你有益。
benefit from be helped by something 受益于
You will benefit from experience. 你一定会从经验中获得益处。
n.[u] anything which is for the good of a person or thing; an advantage; profit 利益；裨益
He gave us the benefit of his advice. 他的劝告对我们很有好处。
transport v. carry people or goods from one place to another运送；运输
They transported the bricks in a lorry. 他们用卡车运砖。
n.[u] carrying people or things from one place to another 运送；运输
We hired a van for transport. 我们雇了一辆货车运东西。
property n. the special and peculiar character of a thing 特性；性质
One property of steel is its hardness. 坚固是钢的特性之一。
n. a thing owned, possessions所有物；财产
Those books are my property. 那些书是我的东西。
range vi. vary within specified limits(在一定范围内)变动；变化
ages that ranged from two to five 两岁至五岁年龄段
n. 范围
beyond the range of human understanding 超越人类理解的范围
plankton n. 浮游生物
all the way 一直；一路上
molecule n. the smallest possible portion of a substance that can exist in the free state分子
A molecule is a thousand times bigger than an atom of hydrogen.
一个分子比一个氢原子大一千倍。
unique adj. 唯一的
This is a unique example of this word before 1800.
这是此一单字在 1800 年前被用过的唯一例子。
adj. 独特的；特有的
Every individual is unique. 每一个人都有他的特色。
hydrogen n. a gas without color, taste, or smell, that combines with oxygen to form water, symbol H 氢
Water, you know, is made up of hydrogen and oxygen. 你知道，水是由氢和氧构成的。
atom n. the smallest piece of a simple substance 原子
According to the theory of atoms all elements consist of atoms.
根据原子理论，所有的元素都是由原子所组成的。
oxygen n.[u] gas in the air that we must breathe to go on living氧；氧气
Oxygen is necessary for all forms of life. 氧气是一切生命所不可缺少的。
relative adj. considered with other things; comparative相对的；比较而言的
All things are relative. 一切事物都是相对的。
solid n.[c] a solid thing 固体
Most solids are heavier than liquids. 大多数的固体比液体重。
adj. hard; not liquid or gas 固体的；坚硬的
Ice is solid water. 冰是固态的水。
freezing adj. 冰冻的；极冷的
freezing weather 严寒的天气
n 冰点
below freezing 在冰点以下
salinity n. 含盐量；盐度
dissolve vt. reduce to liquid form by putting into a liquid; cause to melt溶解；使溶化
Sugar dissolves in water. 糖在水里会溶解。
pure adj. totally clean; not mixed with any other thing纯净的
This water is pure-you can drink it. 这水是洁净的-你可以喝。
gramme n. 克(重量单位=gram)
density n. 密度；浓度
population density 人口密度
relationship n. 关系；联系；亲属关系
The United States has good relationships with most countries in the world.
美国与世界上大多数国家关系良好。
mass n. (物体的) 质量
the law of conservation of mass 质量守恒定律
n.[c] crowd; many things or people together块；团；堆
There were masses of dark clouds in the sky. 天空布满团团乌云。
n.[c] a large quantity or number together大量
There was/were a mass of children in the yard. 在庭院里有很多孩子。
I've masses of work to do. 我有大量工作要去做。
volume n.[u] amount of space that something fills; amount of space in something
容积；容量；体积
Matter has volume. 物质有体积。
cubic adj. 立方的；立方形的
cubic content 容积；体积
kilogram n. (略作 kg.) a measure of weight（重量单位）公斤；千克
There are 1000 grams in a kilogram. 一公斤等于一千克。
float vt & i. to stay on the surface of a liquid (使)漂浮
They floated timber down the stream. 他们把木材顺水漂下去。
Cork floats on water. 软木漂浮在水上。
n. anything that floats on a liquid漂流物；浮物
float bridge 浮桥
take advantage of use someone or something to help oneself 利用
Peter took advantage of his visit to Paris to improve his French. 彼得利用访问巴黎之机提高法语。
decrease vi. become smaller, fewer, etc. 减少；减小
They tried to decrease the costs. 他们设法降低成本。
capacity n.[u] number of things or people that can fit into a place容量；容纳
The seating capacity of this hall is 300. 这个大厅能坐三百人。
n.[u] being able to understand or do something能力；才能
Gavin has the capacity to add numbers quickly in his head. 盖文能很快地做心算加法。
substance n. sort of thing; material物质；东西
Stone is a hard substance. 石头是硬的东西。
n. the chief ideas of a speech or book主旨；大意
The substance of what he said is that we have too little money.
他讲话的大意是我们的钱太少了。
centigrade adj. 摄氏的
Water boils at 100°Centigrade. 水在100摄氏度时煮沸。
absorb vt. to take or suck in, eg water, heat, light, etc. 吸收（水、热、光等）
The heat is absorbed by the water. 热量被水吸收了。
vt. take (learning; knowledge) into the mind 吸收（学问、知识）
He absorbed the point of view of his teacher. 他接受了老师的观点。
vt. to take up all the attention of吸引注意力
His task absorbs him. 他的工作占了他全副精神。
give off emit, send out 发出；放出
The gas gave off an unpleasant smell. 这种气体散发出一种不好闻的味道。
thus adv. for that/ this reason 因此；所以
Thus we see that plants need light. 因此，我们知道了植物需要阳光。
stable adj. firm; not likely to move 稳定的；安定的
He needs a stable job. 他需要固定的工作。
sensitive adj. feeling things quickly and deeply; that one can be easily hurt敏感的；容易生气的
Don't shout at her----she's very sensitive. 别对着她大声喊，她很敏感。
steady adj. not moving; firm 稳固的；平稳的
Hold the ladder steady while I stand on it. 我站在梯子上时，请你把它扶住。
motion n.[u] moving移动；运动
Their study group is in motion. 他们的学习小组正在活动。
dense adj. with many things or people close together 密集的；稠密的
There was a dense crowd at the match. 比赛场上有密集的人群。
trust n.[u] faith; believing that someone or something is good, strong, right, honest, etc. 信赖；信任
I put no trust in his words. 我不相信他的话。
call in ask to come or go in叫…进来；叫…进去
I waited for only two minutes before I was called in. 我只等了两分钟就被叫进去了。
invite: summon 邀请召来；召集
He called all the workers in for a conference. 他召集全体工人开会。
Let's call in a doctor for the baby. 让我们请上医生来瞧瞧这孩子吧。
nursery n. a place where children are looked after 托儿所；保育室
The child goes to a nursery while his mother is at work. 当妈妈工作的时候，孩子上托儿所。
estuary n.[c] 河口
the Thames estuary 泰晤士河河口
tide n. the rise and fall of the sea caused by the moon 潮
The tide is coming in. 潮在上升。
n. a time or season 时；季
Time and tide wait for no man. (prov.) Tide passes quickly,so do not delay taking action.
（谚）岁月不饶人
mammal n. any of the class of animals which feed their young with milk from the breast哺乳动物
Whale is not a fish; it is a mammal. 鲸不是鱼类，它是一种哺乳动物。
reproduce vi. <动植物>生殖；繁殖
Most plants reproduce by seed. 大多数植物靠种子繁殖。
pollutant n. 污染物；污染源
erosion n.[u] 【地质】腐蚀；侵蚀
wind erosion 风蚀作用
recreation n. 娱乐；消遣
play golf for recreation 打高尔夫球娱乐
a variety of 种种；各种
gallon n. a measure of liquid 加仑（液体单位）
One gallon is eight pints, or 4.5 litres. 一加仑等于八品脱或四升半。
define vt. 给 <字词、概念等> 下定义；解释
define a word 给单词下定义
vt. 限定 <界限、范围等>
Boundaries between countries should be clearly defined. 国与国之间的边界应该划分清楚。
