"Every man has his secret sorrows which the world knows not; and often times we call a man cold when he is only sad."

如果拜登当选，你将要付7元、8元、9元。

The Internet is a platform for innovation, but it also requires responsible use.

Enterprises must have the courage to take responsibility and play a leading role in ensuring national energy security.

"Memory is the only paradise from which we cannot be expelled."

Theorems are the milestones of mathematics.