Such chemistry could be a pre-requisite for life.
这样的化学构成可能是生命存在的先决条件。
Endurance is important, but it's not the only pre-requisite for having a successful race.
耐力是重要，但是，它不是比赛成败的唯一前提。
Being polite to the officer isn't necessarily a pre-requisite, concedes Tom.
汤姆承认，对警察是不一定要礼貌对待。
Being polite to the officer isn't necessarily a pre-requisite, concedes Tom.
汤姆承认，对警察是不一定要礼貌对待。
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