| 释义 |
alert adjective VERBS | ADVERB | PREPOSITION VERBSbe, look, seem 警觉；看上去很警觉；好像很警惕become 变得警觉remain, stay 保持警觉keep sb 使某人保持警觉◆The machine should help to keep the pilot alert.机器会帮助飞行员保持警觉。ADVERBextremely, fairly, very, etc. 极其／相当／非常警惕fully 完全警觉immediately, instantly, suddenly 立刻／立即／突然警觉起来◆There was a noise outside and he was suddenly alert.外面有声响，他突然警觉起来。always, constantly 总是很警觉；始终保持警惕mentally 机警◆He was as mentally alert as a man half his age.他像年龄小他一半的人一样机警。PREPOSITIONto 对⋯保持警惕◆Climbers need to be alert to possible dangers.登山者需要对可能存在的危险保持警惕。 |