ad.

1. 很少，难得
   She rarely visits her aunt.

   她难得去看望姨妈。

2. 异乎寻常地，极度
   a rarely beautiful mountain scene

   极其秀丽的山景

3. 特别娴熟地，出色地

adv.

1. not often; seldom.
2. archaic remarkably well.
   ▸to an unusual degree.