The boy puzzled his way through geometry.
那男孩煞费苦心地钻
学。
The boy puzzled his way through geometry.
那男孩煞费苦心地钻学。
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,结合临床检查,利用X射线照相中的学原理确定
牙的位置,以确定手术入路,然后拔除。
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