这种控制晶体形状的调焦肌肉(睫状肌)，长期处于收缩状态。
The focusing muscle (ciliary muscle), which controls the shape of the lens, is thus in a constant state of contraction.
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.
我的孩子不应该，把书本尽可能放远，以便使睫状肌松弛？
Shouldn't my child hold the book as far away as possible to relax the focusing muscles?
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