rarify

v. 使[气体]变稀薄
使成精细

例句与用法：

The rarest quality in an epitaph is truth.

墓志铭的难能可贵之处是真实。

Next to good judgment, diamond and pearl are the rarest things in the world.

次于真知灼见者，为钻石与珍珠为世上最罕有之物耳。

详细释义：

vt.

1. 使变稀薄

2. 使纯化; 使成精细

vi.

1. 成稀薄

2. 纯化; 成微妙