Coal will remain a vital energy source, but only if we evolve with the times.

The hardest thing to explain is the glaringly evident which everybody had decided not to see.

在任何科学事业中取得成功都需要非凡的能力、勤奋和精力。

以往花费许多力量也不能推动它，今天在水中间却能自在地移动。