This template used the amsthm to create theorems, there are 4 types of theorem environments

• Theorem-Class: theorem, lemma, proposition, corollary;
• Definition-Class: definition, conjecture, example;
• Remark-Class: remark, note, case;
• Proof-Class: proof.

Remark: With the option lang=cn, the introductory words of the theorem class environments will be changed to Chinese.