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重点讲解：
1. for sale
供出售；待售；
eg. All the shops on the seafront had crab for sale.
海滨地区的全部商店都出售蟹。
eg. I'm sorry—this painting's not for sale.
很抱歉，这幅画是非卖品。
2. once again
又一次；再次；
eg. I'll run back over the procedure once again.
我把这个程序再复查一次。
eg. Let me remind you once again so that you won't forget.
我再说一遍，省得你忘了。
3. ask for
索要；请求，恳求（给予）；
eg. They'll very likely ask for an increase in the budget.
他们很可能会要求增加预算。
eg. I have the right to ask for an explanation.
我有权要求一个解释。
