Paws might be more useful than wheels in some situations, but cats' claws are retractable: why not retractable wheels?
Paws might be more useful than wheels in some situations, but cats' claws are retractable: why not retractable wheels?
在某些情况下，爪子可能比轮子更有用，但猫的爪子是可以伸缩的：为什么不能有可以伸缩的轮子呢?