中英释义：
双语例句
在海里它似乎是那样地悠游自在，但是它不能永远游在水里。
He seems at home in the sea, but he cannot swim indefinitely.
我们叫它们两栖动物，意思是，它们在水里和陆上都能活得同样悠游自在。
We call such creatures amphibious, which means that they are able to live with equal ease on the land and in the water.
重点词汇
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悠游
roam; wander; meander; saunter; amble; stroll; drift; leisurely; unhurried; carefree; relaxed; easygoing
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自在
free; comfortable; relaxed; unrestrained; ease; easiness; at ease; in element