The cliffs of the Grand Canyon, which stand over 1,800 meters tall, were carved by the Colorado River, which flows across the 336,000-kilometer Colorado Plateau in the southwestern United States.

大谷悬崖高1800多米，由科罗拉多河冲刷而成，该河贯美国西南336000公里的科罗拉多高原。

When the Colorado plateau was uplifted millions of years ago, it gave the water more energy to cut back through the canyon and wear away the rocks.

当几百万年前，科罗拉多高原升起使谷的河流更加凶猛冲击更多的岩石。

He's done the Colorado Plateau, the Four Corners area.

他已经完成了科罗拉多高原和四角地区（美国亚利桑那州、科罗拉多州、新墨西哥州和犹他州交界处）的探索。

It all began about 6 million years ago, when the Colorado River first began flowing down and out of the Rocky Mountains and started carving a path through the Colorado Plateau.

这一切都始于大约 600 万年前，当时科罗拉多河开始流下并流出落基山脉，并开始在科罗拉多高原开辟一条道路。