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The birds cannot afford to relax their vigilance against predators.鸟儿不敢放松对捕食者的警戒。Constant vigilance is necessary in order to avoid accidents.为了避免意外事故,必须经常保持警惕.Never relax your vigilance while you live in peace.你们要居安思危.We...
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vigilance的音标：vigilance的英式发音音标为：['vɪdʒɪləns]vigilance的美式发音音标为：['vɪdʒələns]...
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Drugs are a problem that requires constant vigilance.需要对毒品问题长期保持警惕。Never relax your vigilance while you live in peace.你们要居安思危.Constant vigilance is necessary in order to avoid accidents.为了避免意外事故,必须经常保持警惕....