我们授权您使用我们所有的题目，但您须遵守如下条款：
We authorize you using our all puzzles, but you should obey following rules:

1、如果您是教师，您必须说明您的学校和学生的情况，获得允许后方可在教学中使用。
If you're a teacher, you must explain the situation about your school and student. You can't use them in teaching until permission.
2、题目只能用于学生平时练习或娱乐，但绝不可用于任何考试。
Puzzles can only be using as practice or playing, but mustn't be using in any tests or quizs.
3、如果对方是学生，请选取对于他们适合的难度。
If you're using to students, please choose the suitable difficulty for them.
4、不可用于赛事、出版，或其余商业用途。不可被添加到电脑程序、APP或是你的论文中。
You cannot use puzzles in competition/pubilshing, or other commercial use. You cannot add them into software/APP or your papers.
5、在公众场合展示题目时，请注明题目的来源。
If you're sharing them in public, please clear our address.
6、我们的部分题目已在作者的书籍中出版，请注意法律风险。
Parts of our puzzles were published in author's books, please pay attention to legal risks.
7、祝您玩的开心。
Hope you enjoy the puzzles.