A corneal ulcer can be seen as a white or gray round spot on the cornea that is visible with the naked eye.
裸眼就可观察到角膜溃疡为位于角膜上的白色或灰色圆形病灶。
During 1989~1990, the author studied the round spot of orchid in Hangzhou district.
本文报道了作者1989～1990年对兰花圆斑病的研究结果。
During 1989~1990, the author studied the round spot of orchid in Hangzhou district.
本文报道了作者1989～1990年对兰花圆斑病的研究结果。
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