All the students are expert drivers, but before they drive any of the buses, they will have to pass a special test.

所有的学生都是开车的能手，但在驾驶公共汽车之前，他们必须通过一项专门测验。

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Its biggest asset is a cadre of highly trained, multi-lingual, expert safari guides, drivers, tour leaders, and trackers.

FORBES: The World's Best Safaris

Yet such safety initiatives, recommended by a medical expert panel three years ago for commercial drivers and by the NTSB before that, have languished at the Department of Transportation.

CNN: FAA knew controllers nap, ignored fatigue issue