重點講解：
1. up front
預(yù)付地；先期支付地；
eg. Some companies charge a fee up front, but we don't think that's right.
有些公司預(yù)先收費，但我們認為那是不對的。
eg. You usually have to pay three months rent up front.
通常你需要提前支付3個月的租金。
2. plenty of
（尤指足夠的或超出需要的）豐富，充足，大量；
eg. Foreign investors see plenty of opportunities.
外國投資者看到了大量的機會。
eg. She is in the fortunate position of having plenty of choice.
好在她有很多選擇。
3. stay on
（在別人都已離開或自己打算離開的時間后）繼續(xù)留下；
eg. She will stay on until a replacement is found, and then return to research at stanford.
但是她會留下來直至找到合適的代替者，然后她將回到斯坦福的研究工作中。
eg. I'm not sure whether to resign or stay on.
我拿不準主意是辭職還是留任。