这里有一个标志，写着禁止游泳。

There is a sign here that says no swimming.

这个区域是保护区，所以禁止游泳。

This area is a protected zone, so there is no swimming.

由于安全原因，泳池在晚上禁止游泳。

For safety reasons, the pool has no swimming at night.

公园的池塘边立了一个禁止游泳的牌子。

A no swimming sign is posted by the pond in the park.

这个湖里禁止游泳，因为水质不好。

No swimming is allowed in this lake because the water quality is poor.

此湖禁止游泳。

Swimming is banned in this lake.