以下方位术语解释正确的是（）

A.内侧就是内

B.外就是靠近表面者

C.腓侧就是桡侧

D.小腿的内侧也叫胫侧

E.尺侧就是胫侧

I took the wrong train ______, I didn't even know it until half an hour later. [ ]

A. by mistakes

B. by mistake

C. with mistake

D. with mistakes