I do not understand what you want.
The titles are already translated. Look:

https://www.themoviedb.org/tv/1418-the-big-bang-theory?language=zh-CN
https://www.themoviedb.org/tv/1412-arrow?language=zh-CN
https://www.themoviedb.org/movie/427641-rampage?language=zh-CN

In some cases it is not a literal translation.
But it's the title used in that country or language.
What is your language? Is it Chinese?
And what was the language that you defined when you registered here in TMDb?

Thanks for reply @ticao2 . Yes, they're already translated, but if I want to get them all, I have to query for multiple times (3 times for example above), what I want is query just one time and get all translated titles.

Let me make it clear what I want:
https://api.themoviedb.org/3/translate/title?api_key=###&query=The+Big+Bang+Theory,Arrow,Rampage&from=en&to=zh-cn

It includes 2 technologies: query for multiple movies (separated by comma), and translation between alternative titles.

I'm not an API expert, but I do not think it's possible to query 3 titles simultaneously.
And I've never heard of a translation function using API.
Not even like his example. &from=en&to=zh-cn

Maybe some expert will see your request and be able to respond better.

Hi @qqdaiyu55,

There's no features quite like you're describing on TMDb. All you can do right now is query a specific language like @ticao2 mentioned.

Having said that, I've been meaning to complete this ticket for a while so I just did. If you check the /translation methods on movies, TV shows, people and collections, they all have the title and overview data now. This is a simple and easy approach.

P.S. you will have to wait up to 8 hours for the cache to expire before you see the data available API wide.