450. at the mercy of (=in the power of) 任…摆布, 在…支配下

449. mention sth. to sb. 向某人提起某事

448. on the mend (=in the process of recovering) 好转, 在康复中

447. on memory of 为纪念…

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

445. as a matter of fact 实际上, 事实是

444．major in 主修(某课程)

443. (be) at a loss 不知所措

442. in the long run (=in the end)从长远来说,最后; in the short term (从短期来说)

441. before long (=soon)不久, 过了不久以后.