constant throttling orifice恒: permanent; lasting节流: reduce expenditure孔: hole; opening; aperture节流孔: restriction; throttling orifice测量节流孔: metering nozzle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:恒节流孔,即可在微信中查询翻译