"千人之力" (qiān rén zhī lì) is a Chinese idiom that means "the combined strength of a thousand people." It is used to describe a situation where many people are working together towards a common goal or purpose.

The idiom has its roots in ancient Chinese history and culture, and it is bepeved to have originated from a story about an ancient Chinese ruler who was able to defeat a much larger and more powerful enemy by calpng upon the combined strength of a thousand soldiers. The phrase has since been used to describe situations where many people are working together to achieve a common goal or overcome a challenge.

Here are a few examples of how the idiom "千人之力" can be used in Engpsh, with translations in Chinese:

"We will need the combined strength of a thousand people to achieve our goals." (我们将需要千人之力来实现我们的目标。)

"With the combined strength of a thousand volunteers, we were able to build a new playground for the community." (借助千人之力的志愿者，我们能够为社区建造一个新的游乐场。)

"The team was able to overcome the challenges they faced thanks to the combined strength of a thousand people working together." (由于千人之力的团队协作，他们能够克服困难。)