We recommend using 波利兰. It is a free WordPress plugin and comes with a very powerful and easy to use interface to manage multilingual content. For detailed instructions, see our guide on how to 如何轻松创建多语言 WordPress 网站.
Another popular option is WPML. It is a premium WordPress plugin with an easy to use interface to create multilingual content on your website. For step by step instructions, see our guide on 如何使用 WPML 创建多语言 WordPress 网站.