4In 2007, Barrangou et al. demonstrated for the first time the function of CRISPR/Cas9 as a defensive mechanism of bacteria against bacteriophage attacks by a technique called “plaquing” which builds upon the technique of “plating” bacteria on agar. Plaques of viruses on agar are areas without growth of bacteria due to viral attacks.
这是复杂的过程，不能急，但最基础的礼貌用语，规矩还是要告诉她在什么情况下要说。
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The Department for Environment, Food & Rural Affairs (Defra) said "every household in England" would get weekly food waste collections from next month under new legislation, but 79 councils told the BBC they would not meet that deadline.，更多细节参见safew官方版本下载
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