Parents can't stay by their children's side all the time.
父母不能一直陪在孩子身边。
The process requires special metals that can withstand a huge temperature differential - the side facing the hot gases stays warm, and the other side must stay cool.
这个过程需要一种特殊的金属,它能经受住巨大的温差——一边要接触高温气体而被加热,而另一边则必须保持低温。
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