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重点讲解：
1. keep up with 跟上（变化等）；
I can't keep up with all the changes.
我并非所有的变化都能跟得上。
2. be aimed at 旨在；目的是；
The discussions are aimed at paving the way for formal negotiations between the two countries.
讨论旨在为两国进行正式谈判铺平道路。
3. turn off 关上；关掉；
She was intelligent enough to turn off the gas.
她关掉了煤气，够机灵的。
4. be prepared to do sth. 愿意；
I am prepared to sell my shares at a nominal price.
我做好了以极低价格卖掉自己股份的准备。
