astigmatism例句

Maybe you fall asleep in class because of uncorrected astigmatism.
也许你在课堂上睡觉是因为你的眼睛散光.

They have what is called astigmatism.
他们有所谓散光.

Under astigmatism even narrow parallel light beams will not combine into one point.
有象散存在时甚至很窄的平行光束都不能会聚在一点.

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