If you only need one of the rectangles, pass NULL for the other one.
如果你只需要这些矩形的一个，传递NULL为另外一个。
If there is only one there at 6 weeks you need to keep a check on it.
如果只有一个，那么要保持每6周检查一次。
Actually if you need help you are better off if there is only one person around to help.
实际上，如果你需要帮助而只有一个人在的话，你最好放弃。
Actually if you need help you are better off if there is only one person around to help.
实际上，如果你需要帮助而只有一个人在的话，你最好放弃。
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