An Angle of the wall being given, with the tension of his back and legs, with his elbows and his heels fitted into the unevenness of the stone, he raised himself as if by magic to the third story.

他在墙角里把肘弯和脚跟靠紧石块上的不平处，便能利用背部和腿弯的伸张力，妖魔似的升到四楼。

youdao

Magic legs.

VOA: standard.other