If there's one lesson from the USA Track and Field study, said Dr. Pereles, it is that "sudden changes are probably not a good idea."

皮若勒博士说：从美国田径研究结果能推得的一个教训就是，做任何突然的改变，可能都不是什么好主意。

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It is a lesson that many in the field are belatedly learning.

这是该领域许多人正在事后领会到的一个教训。

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This field trip not only provides a great history lesson, but a environmental one, too.

农场郊游不仅提供了一次很好了解历史的机会，而且也让大家更好的了解环境问题。

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Empty-handed, we drove up to the ranch manager's house to reconvene with the others for our lesson in field dressing.

WSJ: Going the Whole Hog at a Hunting School

O'Day attempted to give me a brief lesson on the Solowheel at Citi Field.

WSJ: Darren O'Day: Here Comes the One-Wheel Reliever

When he arrived in Hollywood in the early 1980s, Marshall Field's department store heir Frederick (Ted) Field, now 49, learned a valuable lesson from the natives: Use other peoples' money.

FORBES: Field of Dreams