只有由睫状肌收缩，短暂的近调焦使远距离得到松弛。
It wants to be relaxed for distance, with the ciliary muscle contracting only for brief periods of close focusing.
肌强直：随意肌收缩后松弛困难的一种肌肉疾病。
Myotonia: Disorder causing difficulty relaxing contracted voluntary muscles.
肌肉抽筋是指肌肉的无意识强烈收缩，无法获得松弛。
A muscle cramp is an involuntarily and forcibly contracted muscle that does not relax.
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