Mr Ashkenazy has informed us that he will be unable to honour his contract with Symphony Hall to perform the piano recital.阿什克纳齐先生已通知我们，他将无法履行和交响音乐厅签订的钢琴独奏演出合同。...
这些试验的有效性已显得令人怀疑.The tests have been shown to be of dubious validity.他们正在检测这种草药作为杀菌剂的有效性.They're doing tests to evaluate the effectiveness of this herb as an antiseptic.蛋白质还可以作为检测实验治疗有效性的标识物.They can serve as markers...