1）envelopen.信封,壳层,封袋n.There are several enclosures in the envelope.n.信封内装有几份附件.2）jugn.水壶,罐,监牢n.She filled the jug with fresh water.n.她将水壶注满了清水.3）sandn.沙,沙子,沙滩,黄灰...