n. a hole for the escape of gas or air
n. external opening of urinary or genital system of a lower vertebrate
n. a fissure in the earth's crust (or in the surface of some other planet) through which molten lava and gases erupt
n. a slit in a garment (as in the back seam of a jacket)
n. 排气口, 出口, 通风孔, 发泄
vt. 发泄, 排出, 给...开孔