短语词组短语drooping characteristics 下垂特性drooping birch 欧洲白桦Drooping Willow 垂柳apex drooping 前缘下弯drooping shoulder 塌肩drooping ear 垂耳drooping carpesium 挖耳草drooping willows 垂柳drooping ears 耳下垂 返回 drooping