You should teach by example.

你必须学习最好的榜样。

youdao

Teach others how to make a difference by setting an example.

通过树立榜样教人如何取得成功。

youdao

Instruction: Real mothers teach constantly, showing both by example and by explanation what their children must know in order to live well.

辅导：真正的母亲会通过以自己为榜样、通过解释孩子必须知道什么才能过好不断教育孩子。

youdao

Unable to speak out openly about a host of injustices across his kingdom, the King could do little more than teach by example, traveling to the remotest regions to support rural development--and short-circuit the appeal of communism to the poor.

CNN: ASIANOW - TIME Asia | Thailand: The King and Ire

We are killing ourselves with work and preparing our children to do the same by failing to teach them, either by example or through formal education, that exercise and physical health are important life concerns.

BBC: School PE lesson

But more importantly, teach them, by example, to be good people, who treat fellow human beings kindly and with respect.

CNN: For Class of 2013, a cold shower