Why Frogs Are Wet

Why Frogs Are Wet

为什么青蛙总是湿漉漉的

Frogs were here on earth before people. They were here before monkeys, or cats. Frogs were here before giraffes. Frogs have been here for millions of years.

早在亿万年以前,地球上就有了青蛙了，那时还没有人类,没有猴子,没有猫咪,没有长颈鹿。

Long before there were frogs, there were fish. The fish breathed through their gills. After a long time, new kinds of fish appeared. These new fish had lungs for breathing. They could live out of water for a little while. When their ponds dried up, they were able to flop about on land. They had to flop, because they had no legs.

早在青蛙出现很久以前,地球上就有了鱼了。鱼用鳃呼吸。经过了漫长的岁月,新的鱼类出现了。这些鱼用肺呼吸,能短暂地离开水生活。当池塘干枯了,它们就跳上岸,在陆地上活动。因为没有腿，它们只能跳来跳去。

Later, some kinds of fish appeared that had legs in place of fins. Now they could move on land or in the water. These were forefathers of our frogs.

后来,又出现一些鱼,它们的鳍已经进化成了腿,既能在陆地上爬,由能在水里游。这些鱼就是青蛙的祖先。

A frog can live in the water and on the land. It is called an “ amphibian. " “ Amphibian" is from a Greek phrase that means “ having a double life. ”

青蛙既能在陆地上生活,也能在水里生活,我们称它为“两栖动物”“两栖动物”源于希腊语，意思是“有两种生活方式。

The frog has wet skin. The wet skin holds the secret of its double life. The frog breathes through its skin. It also breathes through its lungs.

青蛙的皮肤湿漉漉的,藏着它用两种方式生活的奥秘。青蛙不仅用皮肤呼吸,也有肺呼吸。