translation.en: If we go to the dictionary, it says, "It's the lower extremity of a leg that is in direct contact with the ground in standing or walking" That's the traditional definition.
translation.zh: 如果我们去查字典，字典上说：“脚是在站立及行走时， 腿的最末端直接接触地面的部位。” 这是传统的定义。