回上一层第12部 第六课 --- 请重复跟读，直到可以於声音档的留空之间唸完整句為止；熟练之后您必将可以 "脱口而出" 地说出标準的美式英语
- up to date
- I need to get some up to date software.
- Is that information up to date?
- up to now
- Up to now, I have never seen real lightning.
- upside down
- The painting was hung upside down.
- use up
- We have used up all the gas, and there's no gas station near by.
