词汇	rostral though
释义	rostral though 喙槽
随便看	principal voltage characteristic principal voltage-current characteristic principal warfare officer principal wave Principal wave amplifier principal way of doing st principal weight principal weld Principal Welfare Officer principal wife principal winding principal windings principal wire bundle principal wisdom principal word principal work principal work of treatment Principal Works Officer principal yield principal Zhu principal–agent problem principate principates principatie principat normal form