本集核心英语单词及例句：

1.liquid (n.)液体
Was it a gas or a liquid?
它是气态还是液态的呢？

2.preserve (vt.)保护；保持
Who could want to preserve that?
谁会想要维持这种局面？

3.belong (vi.)属于；是…的成员
We know to which generation we belong.
我知道我们属于哪一代。

4.plug (n.)塞子；插头
I've also got a clever plug which you can adapt to fit any socket anywhere.
我还有一个万能插头，可以插到任何一种电源插座上。

5.automatically (adv.)自动地
Helen had snapped it shut automatically.
海伦把它自动合上了。

6.scald (n.)(沸水或蒸汽造成的）烫伤
How big is the temperature causing human body scald?
致使人体烫伤的温度多高？