You cannot afford to relax your concentration for a moment.

你必须集中精力，一刻都不能松懈。

《牛津词典》

You can listen to meditation music, which can relieve stress and relax your mind.

你可以听冥想音乐，这可以缓解压力，放松你的心情。

youdao

Be sure to do some eye exercises to relax your eyes after you study for a long period of time.

在长时间学习后，一定要做眼保健操来放松眼睛。

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

So this is where you'd go to relax, to make a business deal, to meet your friends, to chat, to try to have sex, try to meet somebody.

人们可以在那儿得到放松，谈谈生意，见见朋友，聊天，性爱，约会。

耶鲁公开课 - 新约课程节选

Look straight ahead with your chin level to the floor and relax your throat.

FORBES: Could You Be Sued for the Sound of Your Voice?

You can also apply heat or take a warm bath to relax your muscles.

CNN: What causes muscle cramps?

Just relax your mind for a moment and tell me whether this quote comes from New York or Provo.

FORBES: The Twitter Sex Approval Matrix: Do It in Provo, Abstain in New York