The boy puzzled his way through geometry.

那男孩煞费苦心地钻研几何学。

Methods X-ray dental film and panoramic pantomogram were used to determine the location of embedded supernumerary teeth on bases of the geometrical principle of X-xay photography.

方法通过拍摄X线牙片及全景片,结合临床,用X射线照相中的几何学原理确定生牙的位置,以确定手术入路,然后。