血－生精小管屏障blood-seminiferous tubule barrier, blood-testis barrier
障碍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”。
隔栅barrier
能障energy barrier