sterile
adj. 无生殖能力的，不育的；无菌的，消过毒的；（争论或讨论）毫无新意的，无结果的；（建筑、房间等）呆板的，乏味的；（土地）贫瘠的，不长作物的
例句
He was able to bring large sterile acreages back to fertility.
他能把大片不毛之地变回沃土。
《柯林斯英汉双解大词典》
He always made sure that any cuts were protected by sterile dressings.
他总是确保所有伤口都用无菌的敷料包好。
This top fits over the bottle and keeps the teat sterile.
这个盖子盖在瓶子上，保持奶嘴无菌。
