9.破坏人体的免役系统　

break down the body’s immune system

8.几百万儿童　 millions of children

7.当今最严重的社会问题

　the most serious problem today

6.疾病预防控制中心

　the Center for Disease Control and Prevention

5.通过以下途径传播

　be transmitted via the following routes

4.很难治愈　 be difficult to cure

3.感染艾滋病毒

become infected with HIV

2.对艾滋病人的态度 attitudes towards AIDS

1.接受或容忍 live with

60.听说过这种新磁悬浮列车

hear of the new maglev train

Unit　 7　 Phrases