单词	simple perfect
释义	simple perfect 简单完成时
随便看	elementary matrix Elementary meaning elementary mechanics teaching Elementary Medicine elementary membrane elementary meridianal beam elementary method Elementary Methods in Number Theory elementary microfibril elementary microstructure elementary mineralogy elementary mode elementary model elementary morphism elementary mos device elementary motions elementary move elementary musical theory Elementary music education elementary music teaching elementary name elementary necessaries elementary net system elementary network elementary n-Lie algebras