The coal research is just as important as the DNA work.

The only service a friend can really render is to keep up your courage by holding up to you a mirror in which you can see a noble image of yourself.

The most dangerous phrase in business is 'we've always done it this way.'

义务是由于对法则的敬重而产生的行为必要性。

The balance between energy needs and environmental protection is the challenge of our time.