sterile
adjective uk/ˈster.aɪl/ us/ˈster.əl/
(UNABLE TO PRODUCE)
（生物）不育的;（土地）贫瘠的，不长作物的
(of a living being) unable to produce young, or (of land) unable to produce plants or crops
Mules are usually sterile. 骡子通常无法生育。
One of the side effects of the drug could be to make men sterile. 这种药物的副作用之一是可能会导致男性不育。
缺乏想象力的;缺乏新意的;无生气的
having no imagination, new ideas, or energy
a sterile argument 毫无新意的论点
(CLEAN)
消过毒的，无菌的
completely clean and free from dirt and bacteria
The operation must be carried out under sterile conditions. 手术必须在无菌条件下进行。