The Yangtze River is the longest river in China and the third longest in the world.

　　揚子江是中國最長(cháng)的河流,也是世界第三長(cháng)河。

　　The longest ditch in the world, as it was called, 300-and-some-odd miles out to Buffalo.

　　它被稱(chēng)為世界最長(cháng)的運河，距布法羅城300多公里。

　　It's one of the longest and deepest limestone caves not just in the country but in the world.

　　它不僅是美國最長(cháng)最深的石灰巖洞穴之一，也是世界上最長(cháng)最深的石灰巖洞穴之一。

　　Among them the Yangtze River is the longest one and the second longest one is the Yellow River.

　　其中最長(cháng)的是長(cháng)江，第二長(cháng)的是黃河。