The goal is simple: Isolate a stable hand and head position as you accelerate down the pool with your larger fins.

目标很简单：孤立一个稳定的手，头部位置正如你加速下来你们更大水池的鱼鳍。

youdao

He was said to have head-butted one policeman and stamped on another's hand.

据说他用头撞了一名警察，还把另一个警察的手给踩了。

《柯林斯英汉双解大词典》

I don't know the word for "ribbons", so I put my hand to my own hair and, with three fingers against my head, I looked at her ribbons and said "Beautiful."

我不知道“丝带”这个词，所以我把手放在自己的头发上，用三根手指顶着头，看着她的丝带说：“漂亮。”

youdao

A man stood beside him, and placed a hand gently on his old head.

VOA: special.2010.02.27

One puppeteer controls the doll's head, face,and right hand.

VOA: special.2009.09.23

Steering Poland in the right direction may need a firmer hand and a clearer head than either Kaczynski twin possesses.

ECONOMIST: Poland's awkward government

This leaves most managers with a dual reporting line: to the head of their product division on the one hand, and to the head of their geographical market on the other.

ECONOMIST: Idea

But driving the Model S was so fun, convenient and carbon-and-cash free that I was reluctant to hand the car over and head to LAX to fly back to San Francisco.

FORBES: Road Tripping On Tesla's Electric Highway