noun · the small hole at the end of a sewing needle through which thread is passed

由于视力不好，他很难把线穿过针眼。

noun · a very small hole, such as one made by a needle or a pin

这张纸上面有很多细小的针眼。

noun · (medicine) stye; hordeolum

我眼睛上长了一个针眼，感觉又红又肿。