amphibian

He flew an amphibian, which he could set down on water in case of an engine problem.

他驾驶的是两栖飞机，当引擎出现问题时，他可以把飞机停在水上。

The frog is an amphibian that can live both on land and in water.

青蛙是一种两栖动物，既可以生活在陆地上，也可以生活在水中。