线辘的英文：
spool of thread

a piece of; a reel of; a bolt of; a spool of
一卷

The tin wire was spooled after it was used.
焊丝用完后已卷绕起来了。

There were only two rings of rope spooled on the drum.
只有两圈绳子绕在卷轴上。

We spooled the rope off the drum, and put it down the hill.
我们把绳子从卷轴上绕下来，顺到了山下。

The film fly off the spool and wind itself round the projector.
电影胶片从卷轴滑出缠绕在放映机上了。

pipe bend with female thread
两头带阴螺纹的弯头

To hang by a hair thread
千钧一发

There is a common thread in these two stories.
这两个故事之间有个共同的线索。

The thread unwound a little more.
线又松开了一些。

It is generally accepted that filament threads are stronger than spun threads of the same thickness.
一般来说,长纤纱制成的线比同样粗细的短纤纱制成的线更牢固。