frog

A green frog jumped from the stone into our pond. ▶

一只绿色的青蛙从石头上跳进了我们的池塘。

Declining frog populations can indicate environmental damage because these animals are sensitive to changes in water quality.

青蛙数量下降可能表明环境遭到破坏，因为它们对水质变化十分敏感。