每一种哺乳动物、鸟类和大多数爬行动物、两栖类动物和鱼类都需要睡眠来维持正常的生命活动。

Each kind of mammals, birds and most reptiles, amphibians animals and fish are in need of sleep to maintain normal life activities.

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美国的救援行动主要通过其海洋基地——航空母舰来实现，作为海陆两栖攻击舰，它可以提供医疗救助，并通过直升机和登陆艇进行活动。

The U. S. is sea-basing its operations on an aircraft carrier, an amphibious assault ship, and a hospital ship and is using helicopters and landing craft for movement.

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