backward extension

• 向后延伸

backward extension的用法和样例：

例句

1. 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。