所以，我只需要一个非常粗略的想法及大约的费用。
And then, I only need a very rough idea of how much it might cost.
凯蒂将会有两个星期的假期，她想参加一次旅游，费用大约是25美元。她想去中国历史悠久的首都参观。
Kitty will have two weeks off and she'd like a tour at a cost of about $25. She feels like visiting China's historic capitals.
在线导师的费用大约是传统面对面辅导的一半。
An online tutor is about half the cost of traditional face-to-face coaching.
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