Hover on the top navbar to move to another language.

To add Chinese only pages, just select Chinese to switch language.
Hover on Pages on the left pane, then click Add New.

Edit the page.

We can also use Flexible Content on Chinese Only pages, just click the Page Attributes then select Flexible Content from the Template dropdown.

After editing the page, click Publish. Then, refresh the page to display the Flexible Content blocks.

Relay to Flexible Content documentation to add blocks.
Video tutorial:
https://drive.google.com/file/d/10xY2Y5lzSFJ0oj7PtPRpzWAjPbJf6fTG/view?usp=sharing