This medicine is effective if used within three years.
这种药3年以内有效。
Scientists hope the technology will be available to police within three years.
科学家们希望警方能够在三年以内使用这项技术。
The local steelworks is running down and is likely to close within three years.
当地的这家钢铁厂越来越不景气，有可能在三年内倒闭。
The local steelworks is being run down and is likely to close within three years.
当地的这家钢铁厂越来越不景气，有可能在三年内关闭。
Within three years, the country girl has been turned into a super star.
三年之内，这位农村姑娘变成了一位超级明星。
Within three years, the country girl has been turned into a super star.
三年之内，这位农村姑娘变成了一位超级明星。
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