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...
莫妮卡拿起她的伯罗圆珠笔，放在牙齿间转动着。Monica picked up her Biro and revolved it between her teeth.钻头必须缓慢转动，以保证钻孔平整光滑。The drill should be slowly rotated to ensure a clean hole.轮子一边转动，制陶工人一边拉坯。As the wheel turned, the potter shaped the cl...