zpw2000a轨道电路概述。

2015年BEC初级考试：听力高频短语 　　1. a change of pace 节奏变换 　　You can’t do these chemistry experiments all day long. You certainly need a change of pace. 　　2. a far cry from 相距甚远 　　The published book is far cry from the early manuscript. 　　3. and how 的确 　　A: She’s a good dancer. 　　B: and how. 　　4. a matter of time 时间问题 　　It is only a matter of time. 　　5. a phone call away 一个电话之远，愿意过来帮忙 　　If you need my help. do let me know. Just remember I am a phone call away. 　　6. a while back 不久以前 　　We had a good rain a while back,but we need more now. 　　7. all along 一直 　　I knew it all along. 　　8. anything but 绝对不 　　I was anything but happy about going. 　　9. account for 解释 　　How do you account for it? 　　10. after all 到底 　　A: I’ve just seen the X-rays and your teeth look just fine. 　　B: I see. Then there is nothing to worry about after all.