铅笔的痕迹可被橡皮擦掉.Pencil marks can be erased with a rubber.你可以用橡皮擦掉铅笔记号.You can erase pencil marks with a rubber.你用橡皮擦掉写错的铅笔字迹.You use a rubber to rub out pencil marks which are wrong....
这位作家渊博的学问来自长年累月的钻研.The profound erudition of the writer came from long years of study.他是一位学识渊博的人.He is a very learned man.我们与她在一起很自在，而她渊博的知识令我们叹服。We felt at home with her and were impressed with the depth of her knowledg...
A preliminary groundwork must be laid this year.今年要打好初步基础。Objective To study the preliminary effects of modified black diaphragm intraocular lens implantation on aphakia aniridia.目的探讨带虹膜隔人工晶状体在外伤性无虹膜无晶状体眼中的应用价值.A backgro...