bed sillbed-sillbottom sillfoundation sillground sillgroundselsub-sill底: bottom; base槛: threshold导沙底槛: bed load deflecting sill底槛角度: sill angle进口底槛: inlet sill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:底槛,即可在微信中查询翻译