Single is simple, doule is trouble.

一个人简单，两个人麻烦。

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Single is simple, double is trouble.

一个人很简单，两个人很麻烦。

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There is no simple or single factor that determines if a given site will be a savanna, but some factors seem to play important roles in their formation.

没有什么简单或单一的因素能决定一个给定的地点是否会成为热带草原，但部分因素似乎在热带草原的形成中扮演着重要的角色。

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"The clear message is that breast cancer is not a single, or a simple, story, " Friese said.

CNN: Breast cancer awareness: Not so pretty pink

To further simplify movie shooting, Live View is activated at a single flick of a dedicated switch, and HD video recording is achieved by a simple press of a button.

ENGADGET: Nikon D3100 gets real, adds 1080p movie mode with continuous autofocus

At the end of the day, the single biggest factor we look for in a founder is simple, but perhaps surprising: grit.

FORBES: The Single Biggest Factor VCs Look For In Startup Founders