那只瘦小的猫咪比它的兄弟姐妹们小得多，但精力却旺盛得多。

The ___runty kitten was much smaller than its siblings but much more energetic.

这只发育不良的小狗比其他兄弟姐妹都瘦小。

The ___runty puppy was much smaller and weaker than its siblings.