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446.by all means(=at all costs)不惜一切;(=certainly)当然行;by means of 用…;by no means 完全不，决不
447.on memory of 为纪念…
448.on the mend(=in the process of recovering)好转，在康复中
449.mention sth. to sb. 向某人提起某事
450.at the mercy of(=in the power of)任…摆布，在…支配下
