a daring step or enterprise whose consequences are unpredictable
冒險行動，未知數(shù)很大之舉
with startlingly rapid progress
突飛猛進地
productivity improved in leaps and bounds.
生產(chǎn)率突飛猛進地提高。
(especially of writing) be immediately apparent
（尤指文字）突現(xiàn)，顯眼
Very quickly
非常快地
growing by leaps and bounds.
長得飛快
An act whose consequences cannot be predicted.
無法預(yù)測后果的行為
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無法證明之事物的行為或例子