血－生精小管屏障blood-seminiferous tubule barrier, blood-testis barrier
防火障fire barrier
障碍barrier
【电学】没有电位突变的势垒、表面势垒without potential-jump barrier, surface barrier
地形障碍physiographic barrier
生物[学]障碍biological barrier, biotic barrier
血-脑屏障blood-brain barrier, BBB
胎盘屏障placental barrier, placental membrane; 又称“胎盘膜”。