夜晚是一位伟大的老师，但星星是它的课程。

The world is a mirror of the mind.

The center of our galaxy is a fascinating place where extreme physics takes place, and it's a privilege to study it.

只要我人在国外,我绝不攻击本国的正辅。等回去我再补回来。

Liberal democracy may constitute the "end point of mankind's ideological evolution" and the "final form of human government."

燃气发动机是所有热机中最完美的，因为它结合了蒸汽机和内燃机的优点。