一举手之劳

Explanation: Metaphor of effort, just as one, raising his hand. 　　Source: Han Yu "should be written with human subjects," such as a strong person, sad for their poor and the operation of, build a show of hands every move she makes the workers too. " 　　Examples: They are an unhappy, you can not say that reason, only ~, caused by publishing the doom. (Lu Xun's "Letters To Huang Yuan")