Scientists use "hole" as a metaphor for the area in which ozone concentrations drop below the historical threshold of 220 Dobson Units.

科学家们用“空洞”一词表示臭氧浓度低于220个多布森单位（多布森单位是用来度量大气中臭氧柱尺度的单位。

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When the library is closed, you can drop books in through the special hole in the door.

图书馆关门后，你可以把书从门上专设的小口中投进去。

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If you want a more progressive feeling, drop the shock into the lowest mounting hole.

如果你想要一个更进步的感觉，下降到最低安装孔的冲击。

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Harrington and Hamill both bogeyed the final hole in regulation play to drop back to three under par with McGrane.

BBC: SPORT | Golf | Harrington wins Irish PGA again

All in all, it's an unfortunate situation that could have been avoided entirely had the Augusta rules committee simply asked Woods about his drop on the 15th hole Friday before he signed his scorecard.

WSJ: The Mess at the Masters: Tiger Woods Penalty��John Paul Newport

All the talking heads and golf analysts are filling the airwaves with their opinions on whether a two-stroke penalty administered early this morning was the proper assessment or whether Masters favorite Tiger Woods should have been disqualified for what was considered an unknowing illegal drop on the 15th hole Friday.

FORBES: Tiger Woods' Penalty Should Have Been Assessed On The Spot Or Not At All