Colds mutate even while they're infecting you, and new strains pop up so often that by the time drug-makers create a vaccine against one variation, the serum is already out of date.

即使在感染你的时候，感冒病毒也会发生变异，而且新的病毒毒株经常出现，以至于当制药商研制出针对其中一种变异的疫苗时，血清已经过时了。

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Create a view that categorizes documents by date.

创建一个按日期将文档归类的视图。

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When using this method, it is a good idea to date the files and create a simple backup script that generates suitably named files.

当使用这种方法时，最好注明这些文件的日期，并创建一个简单的备份脚本，专门用来生成指定的文件。

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He did voice a concern that there is no funding to date to create and maintain satellites for this on an operational basis.

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Through Moderator, people can discover existing ideas, questions or suggestions, vote for ideas, questions or suggestions and see the aggregate votes to date, create a new series asking for ideas organized by topic, event or meeting.

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Its simple interface has to date allowed people to create and share over 72, 000 visualizations ranging from the an analysis of the budget for the city of Moscow to tag clouds of the most common word in lyrics by the Beatles.

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