The doctor knifes carefully along a bone in his leg.
医生小心地沿着他的一块腿骨用刀切过。
2
Feel the stretch along the front of the thigh of the bent leg.
腿部弯曲时，大腿的前部要有拉胀感。
3
The eastern leg, along the Grand canal, was supposed to be easiest to finish, but pollution in this heavily industrialised region is so great that water treatment is prohibitively expensive.