underground['^ n d agr a u n d]a.地下的 via['vaia]prep.经过,通过 keyboard[ki:b:d]n.键盘 visual[' vi zj ual]a.视觉的,光学的 originate[a' r i si ne i tJv.发生,开始 originating call发端呼叫
11, Circuit Switching and Packet Switching destination[. de ti' n e i jan]n.目的地,终点 allocate[' aelak e i t]vt.分配,分派,配给 release[ri'li:s]vt.释放,放松,发布 Jargon[吗a:gan]n.行话,土语
I. Revision Teacher uses the following exercise to help the students to revise the important expressions or phrases or sentences which were learnt in the loud speaker, study of last unit eacher: When I say a phrase or an expression in Chinese, you respond by blackboard