大学英语：重要词汇as a matter of fact 实际上，事实是

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

451.be in a mess 乱七八糟，处境困难;make a mess of 弄乱，打乱

452.bear(or keep)…in mind(=remember)牢记

453.bring(or call)to mind(=remember)使回想起

454.by mistake (由于粗心，健忘原因而)错误地