Put your hands on the knees.

把你的手放在膝盖上。

youdao

I began to crawl on my hands and knees toward the door.

我开始手脚并用向门爬去。

《柯林斯英汉双解大词典》

Seeing the big crowd coming towards him, he started to run down the hill, but slipped and went down on his hands and knees in the melting snow.

看到一大群人向他走来，他开始往山下跑，但是滑了一跤，手脚栽进了融雪里。

youdao

The old man sat without moving, his wide old hands resting on his knees.

VOA: special.2010.05.08

By the end, the fighting had sometimes devolved into trench warfare, waged on hands and knees in the middle of the night.

WHITEHOUSE: Veterans Day in South Korea

This morning, like every morning, I sat cross-legged on a cushion on the floor, rested my hands on my knees, closed my eyes, and did nothing but breathe for 20 minutes.

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Though the patches can occur anywhere, they most often appear on the hands and feet, in the front of the bend of the elbow, behind the knees, and on the ankles, wrists, face, neck and upper chest.

CNN: Atopic dermatitis (eczema)