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...