n. a sliding bar in a breech-loading firearm that ejects an empty cartridge and replaces it and closes the breech
n. the part of a lock that is engaged or withdrawn with a key
n. a roll of cloth or wallpaper of a definite length
n. a screw that screws into a nut to form a fastener
n. 门闩, 螺钉, 筛子, 闪电, 意外事件
vt. 闩住, 发射, 脱口而出, 筛, 囫囵吞下
vi. 囫囵吞枣, 射箭, 脱缰, 退出党派
adv. 突然
1. She used a bolt to secure the door.
她用一个螺栓来固定门。
2. The man ran like a bolt when he heard the thunder.
那个男人听到雷声时像箭一样跑了出去。
3. Make sure to tighten the bolt so that the chair doesn't wobble.
确保把螺栓拧紧，这样椅子就不会摇晃。