长城，为什么弯弯曲曲？

The Great Wall of China is very long. 中国的长城非常长。 It does not go in a straight line. 它并不是一条直线。 It winds along the top of the mountains. 它顺着山脊弯弯曲曲地走。 Enemies had a hard time climbing up. 敌人想爬上来难上加难。 The curves made the wall even safer. 弯弯绕绕反而让长城更险。 That is why it looks like a long dragon. 所以它看上去像一条长龙。