例句與造句

1. An accurate replica of the source should be provided for practice in handling and for making accurate measurements of source-detector distances .
   為了練習(xí)操作，為了精確地測量源到探測器的距離，應(yīng)當(dāng)備有源的精確的復(fù)制品。
2. It's difficult to find source-detector distance in a sentence. 用source-detector distance造句挺難的