glgrade linegraded lineslope line坡度: falling gradient; slope; inc ...线: thread; string; wire破背坡度线: broken-beach grade line试用坡度线: trial grade line水力坡度线: hydraulic grade line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:坡度线，即可在微信中查询翻译
