leap in the dark   (TTS發音)

step taken in ignorance of the consequence 不管結果如何貿然行事；魯莽之舉；冒險

    The experiment was a leap in the dark. 此項實驗實在是冒險。

    I'm about to make my last voyage，a great leap in the dark. 我就要作最後的航行，一次大冒險。

    It will be a leap in the dark to make an important decision without investigation. 不進行任何調查就作出重要的決定將是冒險的行動。