He lowers the crane's massive hook.

他放下起重机的大吊钩。

My room was only partly furnished and had no bathroom - it just had a basin and a hook for a towel.

我的房间只有部分家具而且没有浴室——只有一个水池和挂巾的吊钩。

Two hook blocks—one on the main boom and one on the jib can be used to operate the crane.

两个吊钩块（一个位于主臂上，一个位于副臂上）可用于操作起重机。

It is the sturdiest crane of its type and has all the capabilities and adaptability of a fully mobile ring crane, including winches and cables, hook blocks, and a 360 degree slewing capability.

它是同坚固的起重机，具有完全移动式环形起重机的所有功能和适应性，包括绞车和电缆、吊钩组以及 360 度回转能力。