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。

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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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The Croat kept her cool to seal a second round spot at Wimbledon for the first time.

BBC: Elena Baltacha, Melanie South & Katie O'Brien go out

But despite conceding three successive games, Federer rallied to take the first set and after just one hour and 41 minutes he had booked a third-round spot against Paul-Henri Mathieu , who overcame French compatriot Guillaume Rufin 7-6 (7-3) 6-4 6-3.

BBC: Roger Federer wins at US Open as Davydenko & Cilic lose

Scotland's Paul Lawrie, who had started the round in second spot, carded a 73 to drop to sixth overall along with Austria's Markus Brier.

BBC: SPORT | Golf | Battling Casey closes on leaders