First, we need to open the database if it was not previously opened.
第一，如果数据库尚未打开的话，我们需要打开它。
If the user chooses to cancel the operation, then the file is not opened.
如果用户取消操作，则不打开文件。
Even if the door is opened, person who is looked for might not be there.
就算打开了那扇门，你找的人也未必还在原来的地方。
The market will not re-opened on the same day if it was closed.
一经关闭，农墟当天不会再次重开；
The market will not re-opened on the same day if it was closed.
一经关闭，农墟当天不会再次重开；
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