sleeve

这台机器的轴承需要更换新的防护衬套了。

The bearing in this machine needs a new ___sleeve for protection.

这件毛衣的袖子有点长，我需要卷起来。

The ___sleeve of this sweater is a bit long, I need to roll it up.

我把CD放回它的塑料套里。

I put the CD back into its plastic ___sleeve.