Before we knew it three months had passed.

The only problem unconsciously assumed by all Chinese philosophers to be of any importance is: How shall we enjoy life, and who can best enjoy life?

When someone invented the airplane, before you knew it every country had an airplane because there was a best practice, there was a best technology and it was not unique to any one country.

Whenever I talk with my old friends, it is my habit to converted the subject to the old memories, which I feel a warm comfort unconsciously.

I couldn't account for the lump in my throat when I told him the news.