知识扩展
相关变形拓展
三单：bolts→过去式：bolted→过去分词：bolted→现在分词：bolting
易混词辨析
nut、run、bolt
1.nut（名词）：“螺母；坚果”（如 a metal nut；a walnut），与 bolt（螺栓）是 “配套零件”（bolt+nut = 螺栓螺母），含义互补；
2. run（动词）：“跑；运行”（如 Run fast；run a machine），与 bolt “逃跑” 义近义，但 bolt 侧重 “突然、快速逃跑”（如 bolt out of the room），run 无 “突然性”；
3. bolt（名词 / 动词）：“螺栓；逃跑；闩门”（如 a steel bolt；bolt the door），可指 “门闩”，run/nut 无此义；
4. 注意 bolt 作 “逃跑” 时，不可接宾语（如不可说 “bolt the room”，需说 “bolt out of the room”），run 可接宾语（如 run the company）。
短语动词
bolt down 狼吞虎咽 n. a bolt from the blue 突如其来的事件（或消息）；晴天霹雳 an event or a piece of news which is sudden and unexpected; a complete surprise Her dismissal came as a bolt from the blue. 她被解雇简直就是晴天霹雳。 make a bolt for sth make a bolt for it 迅速逃跑；溜走 to run away very fast, in order to escape the nuts and bolts (of sth) (informal) 基本要点 the basic practical details of a subject or an activity have shot your bolt (informal) 竭尽全力；倾其所有 to have used all your power, money or supplies v. close, lock, etc. the stable door after the horse has bolted also (US close, etc. the barn door after the horse has escaped) 马跑了才去关厩门；贼走关门，为时已晚 to try to prevent or avoid loss or damage when it is already too late to do so adv. sit/stand bolt upright 背部笔挺地坐 / 站；坐 / 站得笔直 to sit or stand with your back straight
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