单词	七個一組
释义	七個一組1. septenary
随便看	be on hind legs be on intimate terms be on intimate terms with be on it be on last legs be on legs be on mettle be on nights be on oath (be) on one's back be on one's back be on one's best behavior be on one's best behaviour be on one's dignity be on one's ear be on one's game be on one's good behavior be on one's good behaviour be on one's guard be on one's high horse be on one's hind legs be on one's honor to-v be on one's last pins be on one's legs be on one's mettle