as;as·as注意：the same…as表示同一类，不同一个the same,that表示同一个(2)as与which的区别a.位置不同as可放在主句后，主句前或主句中间；which只能放在主句后。b.as起连接作用，表达说话人...

play an important/vital/essential role (in sth)be of vital importance to sb/sth be of great value/benefit to sb/sth双重否定表强调：Nothing is of more importance than sth5.某人重视...

guaranteed有保证的；有人担保的5.be located at…位于6.mobi l ity n.移动性；机动性；[电子]迁移率mobile adj.机动的；易变的；非固定的7.fami liarity n.熟悉，精通；亲密；随便8.suspicion ...

We have breakfast at seven.(表时间)They were late for the meeting because of the heavy rain,(表原因)作状语What do you mean by doing such a thing??(表方法)Nothing in the world could...

3.坏的bad糟糕的terrible不理想的undesirable不令人满意的unsatisfactory4.无趣味的，无聊的uninteresting令人厌倦的boring,dull,annoying5.难于理解的difficult to understand抽象的，深奥的ab...