One who flies.

飞行员。

One who flees.

逃亡者。

That part of a machine that moves rapidly.

机器中之疾转部分(如飞轮、整速轮、煽纸机)。

A straight flight of steps.

直梯；直阶。

A speculative venture.

【口】投机事业。

Something that moves very rapidly.

快速移动之物(如快船、快艇、快车等)。

A handbill.

【美】【口】传单。