但现阶段的语音合成存在的普遍问题是，合成语音的自然度不够高，韵律调整能力差。
哲学与科学之实质一是自然性，二乃规律性。即应发现与掌握其规律并能乘其自然之势。
为了改善合成语音的自然度，本文在传统分词的基础上提出了词的组合方法。
我们甚至可以说：是否“自然”，就是鉴别一个人歌唱好坏的基本尺度。
1·The primitive conventional right, as the original form of fight, is trotted in naturality and sociality, in egality and distinction, and in spontaneity and must.
具有自然性与社会性、平等性与差别性、自发性和应当性的统一。
2·The essence of philosophy and science is naturality and law, which means to discover, master and go along with the nature of them.
哲学与科学之实质一是自然性，二乃规律性。即应发现与掌握其规律并能乘其自然之势。
3·The periodical has its naturality and sociality.
期刊固有其自然性与社会性。