圆锥角膜是一种先天性发育异常，是一种以角膜扩张为特征，致角膜中央部向前凸出、变薄呈圆锥并产生高度不规则散光的角膜病变。
Keratoconus is an uncommon autosomal recessive inheritance, characteristic of corneal ectasia, which results in the corneal central anterior bulging, conus formation and high irregular astigmatism.
亚历克西斯沿着海岸向前走，然后在一块凸出的悬崖下的阴凉处重新看起书来。
Alexis walked up the coast, and resumed his reading in the shade of an overhanging cliff.
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