It has to be foolproof when he comes home.
他回家的时候,一定要绝对保险。
Traveler's should always be aware: no security system is ever going to be foolproof and 100% secure.
旅行者们得时刻注意:没有任何的安全机制能被证明100%安全。
The treatment will be tried out on human beings only after it has been shown to be safe and foolproof in animals.
该疗法只有在动物身上证明安全、万无一失后才会在人体上试用。
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