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。
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。
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。
A certain field task is designed in each lesson, which is very applicable for students.
每课后老师还会设计一些实际场景练习，帮助学生理解对话内容，并练习如何正确使用。
Object To study the dynamic growth and reproduction of Hirudinaria manillensis Lesson in laboratory with providing the data of artificially breeding leech in the field.
目的研究室内菲牛蛭生长动态和生殖，为人工饲养菲牛蛭提供基础资料。
At the end of half an hour Tom had a vague general idea of his lesson, but no more, for his mind was traversing the whole field of human thought, and his hands were busy with distracting recreations.
快到半个小时的时候，他对要背的内容已有了一个模模糊糊的印象。不过，仅此而已，因为他此刻已经心不在焉，胡思乱想，两手不停地忙着一些无关紧要的东西。
At the end of half an hour Tom had a vague general idea of his lesson, but no more, for his mind was traversing the whole field of human thought, and his hands were busy with distracting recreations.
快到半个小时的时候，他对要背的内容已有了一个模模糊糊的印象。不过，仅此而已，因为他此刻已经心不在焉，胡思乱想，两手不停地忙着一些无关紧要的东西。
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