波既不能有不连续处,又不能有几率为无穷大的区域.The wave has neither discontinuities nor regions of infinite probability.他发现声速面通常是不连续的.He found that the sonic surface was, in general, discontinuous.这就把它们与不连续的 、 短的或定长的纤维区别开来.This differentiates ...
The stores are sometimes sold out of certain groceries.有时商店里的某些杂货会有脱销的现象。He stooped to pick up the carrier bag of groceries.他俯下身去提装着食品杂货的购物袋。Should I nip out and get some groceries?要我赶紧出去一趟买些食品吗？...
她把重点放在介词的使用上.She lays a lot of emphasis on the usage of prepositions.介词和连词是小品词.Prepositions and conjunctions are particles.3加6等于9.(注意,此句中的plus是 介词,plussix是介词短语,作three的 定语,因此,动词用makes, 不用make ) .Three plus six makes nine....