What Are Things Made of?

事物由什么构成？

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Chemistry is about the smallest things that other bigger things are made of, and what happens when they change.

化学是关于最小的物体构成其他更大的物体，以及当它们变化时会发生什么的一门学科。

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It's great to know you've made a difference and things are going to change because of what you've done.

知道你带来了不同，而且一些事情将因为你所做的而发生改变，这种感觉棒极了！

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"This includes monitoring and reacting to what the media are saying about the case and things like the statements being made by witnesses in front of the cameras, " he said.

BBC: Police chief criticises Raoul Moat hunt live TV footage