gravel pass砾石: gravel; grail; dirt排放: discharge; blowoff; blowdown ...孔: hole; opening; aperture排放孔: discharge hole; discharge orifice紧急排放孔: emergency drain下载手机词典可随时随地查词查翻译关注微信公众号:chachacidian,回复:砾石排放孔,即可在微信中查询翻译