a leap in the dark

a daring step or enterprise whose consequences are unpredictable

冒險(xiǎn)行動(dòng)，未知數(shù)很大之舉

by (或 in) leaps and bounds

with startlingly rapid progress

突飛猛進(jìn)地

productivity improved in leaps and bounds.

生產(chǎn)率突飛猛進(jìn)地提高。

leap to the eye

(especially of writing) be immediately apparent

（尤指文字）突現(xiàn)，顯眼

by leaps and bounds

Very quickly

非常快地

growing by leaps and bounds.

長得飛快

leap in the dark

An act whose consequences cannot be predicted.

無法預(yù)測后果的行為

leap of faith

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