Chemistry常用句子Our chemistry paper is too difficult.我们的化学试卷太难了。

　　I'm thinking whether I can pass or not.我在想我考试能不能及格。

　　I like chemistry not because itself is interesting but because there are many experiments in chemistry lab.我喜欢化学不是因为它有趣，而是因为有好多的化学实验。

　　It's dangerous if one doesn't following our teacher's instructions.

　　如果不按老师的示范去做那将很危险。

　　Chemistry is important for me because in the future I want to be a chemist.

　　将来我想当化学家，所以化学对我来说很重要。

　　Is chemistry more useful than physics?化学比物理重要吗?

　　I think chemistry is as important as physics.我认为化学与物理同等重要。

　　Chemistry becomes so interesting with our teacher's explanation.

　　化学经我们老师的讲解显得有趣多了。

　　Do you know what is H2O?你知道H2O是什么吗?

　　I think chemistry teachers are the same characters with rare hair on the head.

　　我觉得化学老师都有相同的特点：头发少。

　　Every time I'm dreaming in class our chemistry teacher pulls me back to his humorous explanation.

　　每次化学课上我昏昏欲睡的时候，我们的化学老师幽默的讲解又使我精神振作。

　　The chemical industry is a fast growing industry in China.化学工业在中国是一种发展很快的工业。

　　Is this a chemical change or a physical change when wood becomes desks?

　　木材变成桌子是物理变化还是化学变化?　　There will.be a chemistry test tomorrow morning.明天上午考化学。

　　Maths常用句子The simplest real numbers are the natural numbers，which are just the ordinary counting number l，2，3…简单的真数是自然数，即平时我们口数的一、二、三…。

　　One convenient way to visualize the real numbers is by the way of a number line.

　　将真数形象化的方便的途径是通过数轴。

　　The numberπis sometimes approximated by the rational number 22/7。圆周率π约等于22/7。

　　Rational numbers and irrational numbers together form the set of real numbers.

　　有理数与无理数一起构成实数。

　　In mathematics the symbol A = B means A and B are two names for the same thing.

　　在数学中A = B意思是A、B是同一事物的两个名称。

　　I become headache with maths problems.我一解数学题就头痛。

　　A right angle is an angle of 90°，and a straight angle is one of 180°。

　　直角是90°角，平角是180°角。

　　Why do we always have maths in the fourth period?为什么我们总在第四节课上数学?