五大湖是北美洲最重要的淡水资源。

wǔ dà hú shì běi měi zhōu zuì zhòng yào de dàn shuǐ zī yuán.

The Great Lakes are the most important freshwater resource in North America.

这片大湖周围住着不少渔民。

zhè piàn dà hú zhōu wéi zhù zhe bù shǎo yú mín.

Quite a few fishermen live around this great lake.

我们沿着大湖走了一圈，花了整整一天。

wǒ men yán zhe dà hú zǒu le yì quān, huā le zhěng zhěng yì tiān.

We walked all the way around the great lake, and it took an entire day.