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。
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。
Perhaps those four who watched Con were taking a lesson.
或许那四只在看着Con的海豚是在上课。
One lesson is divided into four units.
一课分为四个单元。
This lesson is divided into four units.
这一课分为四个单元。
The four young men in our lesson today were taken captive to the country of the enemy king.
犹太人被掠到敌人的国家， 其中也包括今天故事里要讲到的四个年轻人。
The first four lessons will be free. Each lesson lasts 2 hours.
前四次课是免费的。每次课两小时。
Lesson Sixty-four Let's go to plant trees!
第六十四课我们去植树吧！
Lesson Sixty-four Let's go to plant trees!
第六十四课我们去植树吧！
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