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...
Wind turbines are large and noisy and they disfigure the landscape.风力涡轮机个头大、噪音响，还会破坏周边风景。These turbines can be broadly split into two basic types, the impulse and the reaction turbines.这些汽轮机可大致分为两种基本类型, 即冲动式和反动式.The stea...
战争期间，琼帮妈妈给战士们织围巾。During the war, Joan helped her mother knit scarves for soldiers.把公墓建成阵亡战士的永久性纪念碑的工作已经开始。Work began on establishing the cemeteries as permanent memorials to the fallen.为保卫祖国而献身的战士soldiers who died in def...