The book slides from my knee down.

书从我的膝上滑下去了。

youdao

He fell awkwardly and went down in agony clutching his right knee.

他笨拙地摔倒了，紧抓住右膝盖痛苦地蹲了下去。

《柯林斯英汉双解大词典》

youdao

"Just kind of uh, just stepped off the cliff and said 'okay where's that microphone.' Made a short couple of comments and then put the mic down and dropped down on one knee and.

VOA: standard.2010.02.27

Now, let's imagine I've been very lucky and gotten to you-- just get down on your knee.

现在,假设我非常幸运地伤到你了,请蹲下

耶鲁公开课 - 古希腊历史简介课程节选

But a woman right next to Amy had her leg torn off from the knee down, and lost all the fingers in her left hand.

NPR: Marathon Runner Witnesses Double Disasters

Rivera, the career saves leader, missed most of last season after tearing the anterior cruciate ligament in his right knee while tracking down a fly ball during batting practice in Kansas City on May 3.

WSJ: Rivera says Yankees will support Rodriguez

Rivera pitched in nine games last year, his season ending when he tore the anterior cruciate ligament in his right knee while tracking down a fly ball during batting practice in Kansas City on May 3.

WSJ: Yankees' Rivera throws 1st simulated game