adj.不毛的,贫瘠的;不生育的;无菌的;无效果的;
例句:
It had to be sterile.
必须是不结果的.
An operating theatre should be a sterile environment.
手术室应该是个无菌的环境.
Pollen sterile blossoms lack normal turgor.
花粉不育的花朵缺乏正常的膨压现象.