hardpan地下: on the ground砾层: gravel bed盘: tray; plate; dish层: I storey; tier; stratum硬盘层: hard pan; pan horizon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:硬盘;地下砾层;盘层,即可在微信中查询翻译