A bat's wing consists of a thin layer of skin that stretches across four long fingers. And there is a little thumb at the front with a claw on it.

蝙蝠的翅膀是由一层薄薄的皮肤组成，伸展开有四个长指头长，前面有一个短小的大拇指，前端有爪子。

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A bat's wing consists of a thin layer of skin that stretches across four long fingers. And there is a little thumb at the front with a claw on it.

蝙蝠的翅膀是由一层薄薄的皮肤组成，伸展开有四个长指头长，前面有一个短小的大拇指，前端有爪子。

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