Later, the Han, Sui and Jin dynasties all repaired, rebuilt, or expanded sections of the great Wall at great cost to defend themselves against northern invaders.

后来的长城由汉，隋和晋朝以极大的代价来修理，改建或是扩建长城以捍卫自己免于北方的侵略。

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Each group of tasks will be expanded and described in the sections that follow.

我们将在随后部分中对每一组任务进行详细介绍。

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The sections on preoperative pulmonary function testing and tests of exercise capacity have been expanded.

在测试的操作前的肺的功能上的部分和练习能力的试验已经被扩大。

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This year we have learned from our pilot, and have expanded the Academy to two sections of 35 each, with a tutor for each section (Suzanne Tosolini returns, and we are adding Serfi Altun, the founder of Idea Bakery, as a second tutor).

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