Later ships searched, but did not see even a drop of oil on the sea.

事后派船去搜寻，海面上连一滴油也未见到。

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French aeronaut Bertrand Piccard hopes to showcase the potential of green technology — the plane does not use a drop of oil.

法国热气球驾驶员Bertrand Pic card希望展现绿色科技的潜力，因为这架飞机并不耗一滴燃油。

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Here's an ego crusher for mice. Even a drop of oil can navigate a complex maze. If you don't believe us, check out the video.

对于老鼠来说这个迷宫就是自尊粉碎机。但是一滴油却能破解这个复杂迷宫。不信，看看视频吧。

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Some 25% in revenue of what is potentially billions of pounds worth of oil will, however, be a huge boost to a country which has never successfully extracted a drop of oil in the past.

BBC: Ireland 'close to oil billions'

Gliding across Prince William Sound by kayak, you can't imagine that the 986-foot Exxon Valdez ever spewed a drop of crude oil, let alone 11 million gallons.

FORBES: Magazine Article

Gabon's coin pictures a large drop of oil.

FORBES: Living People On Legal Tender