帮忙翻译下，速度速度

1.China has a longer history than the United States.

2.There are many bamboo forests in China.

3.The most common animal in America inthe dog.

4.The most populated part of China in the southeast.

5.China is one of the oldest civilizations in the world.

6.There are no man-made structures as big as the Great Wall.

1.中国的历史比美国的历史悠久。
2.在中国有许多种植竹子的森林。
3.在美国最常见的动物是狗。

4.中国最密集的一部分是东南地区。

5.中国是世界上文明古国之一。

6.有任何人造的和长城一样大。