同根派生 英汉例句用作名词 (n.)The membranes extend backward to encompass hind limbs that are quite a bit smaller than those of a terrestrial mammal of comparable body size.翼膜向后延伸包围住后肢，蝙蝠的后肢比其他体形相当的陆栖哺乳动物明显小了许多。