The world is full of people whose notion of a satisfactory future is, in fact, a return to the idealised past.

当面临挑战时，专注于解决方案而不是问题。

煤炭的未来取决于我们能否使其更清洁、更高效。

The beauty of mathematics is that it is one of the few areas of human endeavor where absolute truth can be known.

The past, like the future, is indefinite and exists only as a spectrum of possibilities.

The process of verification is as important as the process of creation in computer science.