海洋中的废物对各种海洋哺乳动物有害。

Waste in the oceans is detrimental to various sea ___mammals.

要欣赏如海豚等海洋哺乳动物，偏远岛屿是理想地点。

To admire sea ___mammals such as dolphins, remote islands are ideal locations.

蝙蝠是唯一会飞的哺乳动物。

The bat is the only flying ___mammal.