“无菌的”用英语怎么说

尿液是无菌的。Urine is sterile.手术室应该是个无菌的环境.An operating theatre should be a sterile environment.生长中的胎儿是处于无菌的羊水中,羊水能避免碰撞和病菌.A developing baby floats in sterile amniotic fluid , protected from bumps — and bugs....