[建筑学]拱顶石:位于拱顶的塞缝石.Architecture The keystone in the crown of an arch.用防水原料填塞缝隙或塞缝片一年也能节省一千七百磅.Caulking and weather - stripping can save another 1,700 pounds per year....
It can not impair the intellectual vigor of the young.这不能磨灭青年人思想活力.The author's half drunken state did not in the least impair his eminence in my eyes.在我的眼里,这位作家的醺醺醉态丝毫无损他的高尚.A recurrence of such an oversight could ...