美国有30艘，全部非常大而且装备有飞行甲板和直升飞机，加上登陆艇。

The U. S. has 30, all much larger and equipped with flight decks and helicopters, plus landing craft.

youdao

美国有30艘，全部非常大而且装备有飞行甲板和直升飞机，加上登陆艇。

The U. S. has 30, all much larger and equipped with flight decks and helicopters, plus landing craft.

youdao