What is the biggest canyon in the United States? 美国最大的峡谷是哪个？

　　It is the Grand Canyon in Arizona. 它是位于亚利桑那州的科罗拉多大峡谷。

　　The Grand Canyon national park is one of the first national parks in the United States. 科罗拉多大峡谷国家公园是美国的第一个国家公园。

　　The Grand Canyon was not made in one day. 科罗拉多大峡谷不是一天形成的。

　　It took 6 million years to make it. 它的形成历经600万年。

　　It is 446 kilometers long, and 1.8 kilometers deep. 它长446千米，深1.8千米。

　　A long time ago, native Americans believed the Grand Canyon was a holy place. 很久以前，美国土著民认为大峡谷是圣地。

　　So, they visited the Grand Canyon to pray. 所以，他们是去大峡谷祈祷。

　　Now, we visit the Grand Canyon to have fun. 如今，我们是去大峡谷游玩。