a daring step or enterprise whose consequences are unpredictable
冒险行动，未知数很大之举
with startlingly rapid progress
突飞猛进地
productivity improved in leaps and bounds.
生产率突飞猛进地提高。
(especially of writing) be immediately apparent
（尤指文字）突现，显眼
Very quickly
非常快地
growing by leaps and bounds.
长得飞快
An act whose consequences cannot be predicted.
无法预测后果的行为
The act or an instance of believing or trusting in something intangible or incapable of being proved.
信仰不可捉摸：信仰或相信不可捉摸或无法证明之事物的行为或例子