bolt

一道闪电划破黑暗的天空。

A bright ___bolt split the dark sky.

弩手瞄准目标，射出一支粗箭。

The crossbowman fired a heavy ___bolt at the target.

睡前别忘了把门上的插销推上。

Don't forget to slide the ___bolt across the door before going to bed.