煤炭是我国的主体能源，在相当长时期内仍将是我国能源安全的基石。

The best thing about a boolean is even if you are wrong, you are only off by a bit.

Persist in doing what you love, one day you will be seen.

世界上充满了显而易见的事情，但偏偏没有人注意到。