例句與造句

1. In order to compensate for the divergence of the X-rays, he constructed a diagram of tightly packed concentric circles, approximated to spirals, geometrically related to the divergence and the distance between the X-ray tube and the film, and frame planes, for determining the target coordinates; it has to be admitted, however, that in contrast to Leksell s other inventions many surgeons found it difficult to understand and use this diagram.
2. It's difficult to find frame plane in a sentence. 用frame plane造句挺難的