knows of短语³⁴⁶¹⁷ 基本例句 v.知道有；🌏单词不难 Siemens says it knows of15 plants around the world that were infected by Stuxnet, but their operations were unaffected as they were not the intended target. 西门子公司称，他们获悉全球范围内已有15家工厂受到 Stuxnet感染，但它们仍在照常运转，因为这些工厂不在黑名单之中。 ecocn