同根派生 英汉例句In middle Chinese, there is not distinct regularity in every meaning.在整个中古时期，各种用法的发展变化没有明显的规律。Jeju Island is Korea's largest island, retains geological features of the Middle Ages.济州岛是韩国第一大岛，至今仍保留着中古时期的地质地貌。