Lacus

例句：

1. 1. The lake is crystal clear and surrounded by lush greenery.
   这个湖清澈见底，四周郁郁葱葱。
2. 2. The fish in the lake swim around aimlessly.
   湖里的鱼游来游去，毫无目的。
3. 3. The lake is a popular spot for bird watching.
   这个湖是观鸟的好地方。