例句與造句

1. To my knowledge , no such concave mirrors made by reversing a glass sphere survive in museum collections , and no contemporary documentary evidence indicates that anyone made concave mirrors by reversing blown glass spheres
   據(jù)我所知，目前博物館里，沒有任何利用玻璃球內(nèi)面制造的凹面鏡，也沒有任何那個時代的文件證據(jù)指出，有人制造過利用玻璃球內(nèi)面做成的凹面鏡。
2. It's difficult to find reverse a glass in a sentence. 用reverse a glass造句挺難的