The walls, desks, and ceilings of his classrooms teem with projects, from field guides on local wildlife to human-powered submarines.

他们教室里墙上，桌子上，和天花板上布满了各种作业项目，从当地野生动物的观察指南到人力潜水艇等等。

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Birders can generally identify every species on their life list, though they may consult with numerous field guides for certainty.

尽管他们有时也要通过众多观鸟指南的参考来确定，但鸟人通常可以确认他们自己的鸟种清单上每一个鸟种。

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All or nearly all visitors will be shepherded by guides to field questions and keep crowds moving.

基本上所有游客到时都会由导游引导参观，导游会负责讲解和保持人流流通。

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The popularity of the pastime is reflected in the smash success of two comprehensive new field guides published this fall, The Sibley Guide to Birds and Birds of North America (see sidebar).

FORBES: Wings of Desire