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。
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。
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。
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。
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