He may well wish he had learned that lesson four years ago.
他可能想着要是四年前就吸取了教训那该多好。
In lesson four - part two, I show how to create and connect an interface.
第四课-第二部分，我将展示如何创建和连接接口。
让我们学习第四课。
Lesson Five is as difficult as Lesson Four.
第五课和第四课同样难。
Lesson Three is much easier than Lesson Four.
第三课比第四课容易多了。
Lesson Five is a little easier than Lesson Four.
第五课比第四课稍微容易一点儿。
Lesson Five is a little easier than Lesson Four.
第五课比第四课稍微容易一点儿。
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