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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Affective and natural human-computer interaction is a challenging lesson in the field of computer application.

计算机能与人类进行具有情感和自然和谐的交互是计算机应用领域一项富有挑战性的课题。

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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