座头鲸以每小时1.6公里的速度从阿拉斯加游到夏威夷。
Humpback whales swim at a speed of 1.6 kilometers an hour from Alaska to Hawaii.
三年前我们家乡建了一座三公里长的桥。
A 3-kilometer-long bridge was built in our hometown three years ago.
这座桥的一部分是一条长6.7公里的海底隧道，横穿两座人造岛屿。
In one part, the bridge turns into a 6.7km undersea tunnel that passes through two man-made islands.
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