Generally speaking, heaviness of the muscles around the eyes, including the levator muscles that open the upper eyelids, is similar to fatigue of any muscle of the body.

一般来说，眼周肌肉包括上睑提肌的沉重，和全身其他肌肉的疲劳类似。

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It is composed of open type engine body, hydraulic power cylinder, upper pressure head, and lower type box. The type box can be collocated with manual four-positions renewal.

有开式机身、液压动力缸、上压头、下字盒等组成。下字盒可配手动四位根据用户要求更换。

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