They can last for only half an hour or up to a week.
这种头痛的持续时间少则半小时，多则一个星期。
These fans will either blow the air down or up, depending how you set them.
吊扇可以把空气向上或者向下吹——这取决于吊扇是怎样安装的。
Then the dog will be unresponsive for a few seconds or up to a minute.
然后狗狗将在数秒至一分钟内没有反应。
To date (or: Up to date) twenty students have been accepted into the school.
到目前为止已有二十名学生被接受入学。
To date (or: Up to date) twenty students have been accepted into the school.
到目前为止已有二十名学生被接受入学。
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