I never found the missing piece.

我一直没找到丢了的那件。

《牛津词典》

He gives up the missing piece, and Scylla boots up.

他交出了藏起的零件，“锡拉”被启动了。

youdao

Blogging was the missing piece in my social media strategy.

博客是我的社会媒体战略中缺失的一个环节。

youdao

It had been fixed with a piece of blue paper and the upper right hand corner was missing.

VOA: special.2009.01.17

Now with LeRoi Moore gone, a piece of the puzzle is missing.

VOA: special.2009.08.28

But we think that the big piece that is missing is the kind of transformation in human culture, away from consumerism towards a culture of sustainability."

VOA: standard.2010.01.23

So the missing piece for Peace: resolve the underlying cause of strife rather than tussling with the symptoms.

FORBES: To Bring True Peace To The Middle East, Women In Palestine And Israel Must Take Center Stage

The missing piece was bound to be missing and 343 Industries essentially had no way of getting it back.

FORBES: 'Halo 4' And The Impossible Quest For Novelty And Wonder

Bardin sees crowdsourcing as the missing piece in the navigation puzzle.

FORBES: A Crowd-Sourced Navigation Service