// 倒序遍历2*len-1次：模拟数组循环（核心！易错点1）
return new TextEncoder().encode(str.toUpperCase());
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.，这一点在heLLoword翻译官方下载中也有详细论述
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“功成不必在我，功成必定有我。”
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