nib|nibs

钢笔的笔尖有些磨损，需要更换了。

The ___nib of the pen is worn out and needs to be replaced.

当这位大人物到场时，所有人都得站起来迎接他。

When his ___nibs arrived, everyone had to stand up to greet him.

这支钢笔的笔尖有点歪，写字不太流畅。

The ___nib of this pen is slightly bent, making it hard to write smoothly.