谁能帮我翻译一下If you need to cancel, you must do so by 04:00 PM 12

来源：学生作业帮编辑：搜搜做题作业网作业帮分类：英语作业时间：2024/06/06 02:53:50

谁能帮我翻译一下
If you need to cancel, you must do so by 04:00 PM 12/09/2011 or your credit card will be charged for one night's stay.
,这是美国订房间的,后来又取消了,下面这句话的意思是需要在这个时间之前取消否则会被扣费还是说只有在这个时间才能取消否则会被扣费?

“如果你需要取消,你赶在必须在 2011年 12月9号之前,否则你的信用卡将会被扣费”
or 是否则的意思
这个时间取消前就不会被扣费
再问：我主要是纳闷他为什么要用by呢，能解释下吗？如果写成must do so before不就没问题了嘛。。。主要是by我比较纳闷
再答： by 表示不迟于... 到某时为止...在某时之前其实这里用before 也是一样的意思但是 by 更强调的是在....之前，是一个时间段

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