As the number of people reachable by e - mail has expanded , the lure of reaching large numbers of people for free has become irresistible to marketers , hucksters , crackpots , and anyone who just wants some extra attention 随着使用因特网人数的增加（自因特网建立以来，人数一直在增长） ，对于商人、小贩、想入非非者以及蓄意破坏者而言，可以无偿地联系到数目巨大的各类人的诱惑力变得难以抵挡。
At present , though the double - track system used in urban land has got rid of some problems of traditional land - use system , most nationalized land in urban is still being free and long occupied by these state - owned enterprises which lack good management and competitive strength , the efficiency of land - use is low 目前城市土地使用的“双轨制”虽然克服了传统土地使用制度的某些弊端,但是大量城市国有土地仍被许多管理不善和缺乏竞争力的国有企业无偿地长期占用,土地利用效率低下。
