题目内容
When severe winter sets in, the dog won't stand by its owner.
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A pet owner must be nice to his pet, hoping that the pet keeps his company forever.
A dog will retreat when it encounters tough difficulties.
When the owner becomes poor and his fame is ruined, the dog's love remains constant just like sunrise and sunset.
在高温高压下，氢与钢中的碳发生反应生成甲烷气体，从而导致钢的塑性降低，这种现象叫做（)
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