短语词组短语burrow pore 生物钻孔pelecypod burrow 瓣鳃动物潜穴crawling burrow 爬行潜穴entrapment burrow 覆埋穿孔protrusive burrow 前进式潜穴Halfling Burrow 半身人地穴John Burrow 约翰·布罗accessory burrow 副穴burrow into 探查 返回 burrow