I heard the sound of a bolt being slowly and reluctantly slid open.

我听到门闩被人缓慢而费劲地抽出来的声音。

《柯林斯英汉双解大词典》

Have you ever used a hammer and screwdriver to loosen a nut from a bolt?

您是否曾经用过锤子和螺丝刀从螺栓上拧下螺母？

youdao

Her dismissal came as a bolt from the blue.

她被解雇简直就是晴天霹雳。

《牛津词典》

A crash of thunder sounded as a bolt of lighting struck the ground close to the basket where the rain babies slept.

VOA: special.2009.02.28

Bolt shattered his old mark by 11-100ths of a second to set the new world record of 19.19 seconds.

VOA: standard.2009.08.21

Fellow selector and track legend Edwin Moses say it will be difficult for Usain Bolt to win the title for a second consecutive year.

VOA: standard.2010.02.11

Lisburn councillor Stephen Martin said the news had "come as a bolt out of the blue".

BBC: Coca-Cola bottling plant

Until, that is, another shock, a bolt of lightening perhaps, sends them off in another direction.

BBC: The currency stampede

Wade on abortion, decided in 1973, which came as a bolt from the blue.

FORBES: What hidden perils await her on the Court.