When someone is nasty， rude， hateful， or mean with you， pretend they have a disease. That makes it easier to have empathy toward them which can soften the conflict.

The PAC learning framework provides a formal way to quantify the learnability of a concept class.

The Belt and Road construction should adhere to the principle of extensive consultation, joint contribution and shared benefits.

"La ficción es la mentira que nos permite decir la verdad."

最好的数据库系统是对用户不可见但功能强大的系统。