Definition: an animal that feeds its babies on milk from its body Level: C1
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.
