重點講解：
1. up one's sleeve
藏有…想法；留有錦囊妙計；心中另有…高招；
eg. He wondered what Shearson had up his sleeve.
他暗自猜度希爾森究竟有什么高招DP4FdwZuX1o3T2。
eg. I'd been doing some quiet investigating in the meantime and had an ace up my sleeve.
與此同時，我不動聲色地展開了調查，掌握了一張王牌GIXSVm[+eV*qdl2K。
2. for sure
無疑；肯定；
eg. You'll have it for sure by the end of the week.
這個周末你一定能收到它的QNk#.1dX2BZVDoh22[。
eg. For sure today was a not great day for us.
當然今天對我們來說不是非常好的一天n~QCCD#QZ%gEA#Zj@。
3. feel free
請隨意；不必拘謹；
eg. Go right ahead. Feel free.
開始吧wG!(lCrJTsLJ6)qWr@。請便ay==OzvyfPg=。
eg. If you have any questions at all, please feel free to ask me.
如果有任何問題，請隨意提問XW[,eiI(L0。