1.High School English Reading Listening

Annealing is a way of making metal softer by heating it and then letting it cool very slowly. If metal is heated and then cooled very quickly, for example by dipping it in water, it will be very hard but also very brittle that is, it will break easily. Metal that has been annealed is soft but does not break as easily. It is possible to make metal as hard or as soft as is wished, by annealing it. The metal is heated, and allowed to cool slowly for a certain length of time. The longer the heated metal takes to cool slowly, the softer it becomes. Annealing can also be used on other material, such as glass.
译文：
退火是通过加热金属，然后让它非常缓慢地冷却来使其变软的一种方法。如果金属被加热，然后迅速冷却，例如将其浸入水中，它将非常坚硬，但也非常脆，也就是说，它将很容易破碎。经过退火处理的金属是软的，但不容易断裂。通过退火，可以使金属随心所欲地变硬或变软。金属被加热，并允许缓慢冷却一定的时间。加热的金属慢慢冷却的时间越长，它就变得越软。退火也可用于其他材料，如玻璃。
重点词汇：
重点词汇
and then 然后
for example 例如 ; 比如
very hard 非常困难
but also 而且
has been 已经
does not 不 ; 不是 ; 否定就用
length of time 时长 ; 时间之长