| 21. | He had his lesson at his finger-ends. |
| 他很熟悉他的功课。
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| 22. | He will not hold a lesson this afternoon. |
| 他今天下午不教课。
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| 23. | He seemed rather to be repeating a lesson learned by heart than relating a fact from his own knowledge. |
| 他似乎在背书而不是在讲述他所了解的事实。
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| 24. | Each history lesson lasts 40 minutes. |
| 每堂历史课上40分钟。
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| 25. | He has never received a single lesson on the subject. |
| 这门学科的课他一节也没有听过。
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| 26. | Tomorrow we'll take the tenth lesson . |
| 明天我们上第10课。
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| 27. | The lesson for today is on page 20. |
| 今天教的新课在第20页。
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| 28. | A valuable lesson may be gleaned from it by those who have eyes to see. |
| 明眼人可从中发现宝贵的教训。
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| 29. | The lesson was impressed on the pupils' minds with great force by the teacher. |
| 教师竭力使学生们牢记这一教训。
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| 30. | It serves as a lesson to him. |
| 这对他是一个教训。
|