No, I guess Rosebud is just a… piece in a jigsaw puzzle… a missing piece.

我猜，玫瑰花蕾也许就是拼图上的一块，遗失的一块。

youdao

There is, however, still a missing piece: a fix for the broken acquisition system.

然而，还是有不足之处：没有对千疮百孔的采购系统做出补救措施。

youdao

Also, the XML client is as automated as possible, but it is not unreasonable to expect the user to provide a missing piece of information.

而且，XML客户机是尽可能自动化的，但是期望用户能提供足够完整的信息也是完全合理的。

youdao

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

VOA: special.2009.01.17

What's missing in this model of this piece of soccer, this game within a game?

在这个足球的模型中我们忽略了什么,这是一个博弈的模型对吧

耶鲁公开课 - 博弈论课程节选

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

VOA: special.2009.08.28

Pinterest Inc. is getting ready to add a missing piece to its business: revenue.

WSJ: As Pinterest Grows, Startup Seeks $2.5 Billion Valuation

She acknowledges that a vaccine against HIV is still "a missing piece" in the jigsaw - but believes remission is an achievable objective.

BBC: HIV funding cut as science brings 'decisive moment'

Situations like that are of a sort that concierges from Nashville to New York or Nice see so often they've become commonplace: A guest is in a panic and can't fathom a solution to their problem, whether it's a soiled suit, a canceled reservation or a missing piece of luggage.

FORBES: Magazine Article