这本书以其精彩的封面和引人入胜的文字成为科学领域独特的《无所不知》系列丛书的一部分，此书围绕蛙类展开。你知道随着青蛙的生...

As part of the unique, science Know-It-Alls! Series that features stunning covers and engaging text, this book puts the spotlight on Frogs! Did you know as a frog grows it has to...