速记和打字被说成是一对孪生技巧.Shorthand and typewriting have been described as the twin arts.这对孪生兄弟为国流血牺牲,死而无憾.The twin brothers bled for their country and died without any regrets.这对孪生兄弟外貌很相像,但性格却相差很大.The twin brothers are alike in a...
内部的口袋将是和外部的乙烯基相同的颜色.Inside pockets shall be same color as outer vinyl.为了增强紧凑性,折边的榻榻米周围还布置了乙烯基塑料地板.To advance its tenseness , hemmed tatamis were arranged together with vinyl flooring.以二丙酮醇和丙烯腈为原料,利用简便、温和的反应条件合成新型乙烯基功能单体-...