左使是汉语词语，拼音为zuǒ shǐ，意思是做弄、使弄、指使。
因为开始的时候是左脑疲劳，所以我们需要换右脑运行，使另一半有时间休息和恢复。
So we need to turn our right hemisphere to allow time for the other to take a break and recoup.
它仍然在他脑海中，正如他具有推理能力的左脑，使他在急救医学领域从事工作27年。
It remained in his mind even as his rational leftbrain kept him on the job in emergency medicine for 27 years.
保持脊柱处于中正、放松的位置，然后向左转头，并且使目光越过左肩，凝视远处。
With your spine in a neutral, relaxed position, rotate your head to the left, gazing over your left shoulder.
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