The Botulinum toxin, which is produced by the bacterium Clostridium botulinum, works by temporarily paralysing key muscles in the forehead.

肉毒杆菌毒素是由芽孢梭菌肉毒菌产生的。作用原理是暂时麻痹额头的主要肌肉。

youdao

The key muscles on each actor's face were painted with 52 tiny green dots so that their movements could be tracked, and the actors' expressions could be determined.

每一位演员的面部主要肌肉都被涂上了52个绿色的小点，这样便于追踪他们的动作并测定他们的表情。

youdao

A key discovery was that if the inside of the mask is smooth - even if the outside is bumpy with pores, a nose and other features - it will stretch over most faces and move with facial muscles.

最关键的发现是，如果面具内部平滑，即使外面的气孔，鼻子和其它部位凹凸不平，它也会在面部伸展，随着肌肉的伸缩而移动。

youdao

If you sit in your chairs and look at this keyboard, and relax your muscles and imagine moving your right arm up and hitting the "s" key.

当你坐在椅子上，注视着电脑键盘，放松肌肉,想象你抬起右臂敲击，S，键。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

Hemoglobin is the key to being able to transport oxygen to muscles.

WSJ: U.S. Ski Team Pins Hopes for Sochi on Science

House said the key to keeping a quarterback healthy and mechanically sound is to keep the oft-ignored decelerating muscles, generally called the rotator cuff, stronger.

WSJ: Tom Brady, Drew Brees Gets Help From the Best Baseball Coach in the NFL