*** no-brainer ***

不费脑经的事，某件事情非常明显或容易决定，以至于不需要花很多思考。

词组分解 

brainer - 费脑经的事

例句

Choosing this software is a no-brainer since it offers more features at a lower cost.

选择这款软件是个不费脑筋的决定，因为它以更低的成本提供了更多的功能。

Promoting him is a no-brainer. His performance has been outstanding.

晋升他是个简单的决定。他的表现非常出色。