You would have to say "The Chinese are...: Adjectives by themselves cannot be subjects.
It's only in English, you'll notice that Dulingo is very picky with English. Whereas it is more linient with Grammar Mistakes in other Languages.
This is particular annoying for people who don't have English as their native Language.
Just to make sure I got that right: Çin means Chinese, the adjective as in: Çin yemeği and China, the country Çinliler are people from China (Çinler would not be correct, would it?) Çince is the language ?
- Çin is Chinese as an adjective or China. (Çin büyük bir ülkedir. Çin yemekleri güzeldir)
- Çinli is a Chinese person (Çinli kadın çok üzgün. Sen Çinli misin?)
- Çince is the language (Çince çok zor)
Çinler has no meaning