doublebarreled drilling双: two; twin; both; dual井筒: rockshaft; pitshaft; wellhol ...钻进: worm one's way in; drilling井筒钻进: mine shaft drilling井筒钻凿: shaft drilling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:双井筒钻进，即可在微信中查询翻译
