It doesn't make sense on its own.

它单独存在时没有意义。

Every country has its own national hero.

每个国家都有自己的民族英雄。

Each country has its own unique culture.

每个国家都有自己独特的文化。

A main clause can make sense on its own.

主句可以独立成句。

Each dolphin has its own signature whistle.

每只海豚都有自己的标志性哨声。

Each state can make its own laws for how much PE students need to take.

每个州可以制定自己的法律，规定学生需要上多少体育课。

Each different part of China has its own special forms of traditional art.

中国的每个地方都有自己独特的传统艺术形式。

This world has its own law.

这个世界有它自己的道理。

The book has its own charm.

这本书有它的独特魅力。

His life has its own rhythm.

他的生活有自己的节奏。