It is a painless, non-invasive procedure that involves wearing a series of specially designed rigidcontact lenses to gradually reshape the curvature of the cornea.
这是一种无痛、无创伤的疗法，通过佩戴一种可以改变角膜的曲率的硬性隐形眼镜来达到矫治散光的目的。
2
Black members were less rigid: they were 10 times more likely to contact whites than whites were to contact blacks.
黑人不像他们那么死板，他们愿意与白天接触的比率是白天愿意与黑人接触的十倍。
3
In the second chapter contact problem of a half-plane with periodic cracks under periodic rigid punch action is studied.