管理员摘要：
Some lakes are still dirty. 一些湖泊依然很脏。 Thousands of lakes have dried up. 数千个湖泊已经干涸。 I have been to many famous lakes. 我去过很多著名的湖泊。……
Some lakes are still dirty.
一些湖泊依然很脏。
Thousands of lakes have dried up.
数千个湖泊已经干涸。
I have been to many famous lakes.
我去过很多著名的湖泊。