Change doesn't happen overnight, but every step forward is a step in the right direction.

The story of human evolution is a story of migration and mixing.

过去总是在作品中显现。

释义：他或许认为，物质的产生和消亡都源于气的聚散，气是物质生死循环的驱动力。

The best fiction is far more true than any kind of journalism.

投资清洁煤炭技术不是开支，而是对我们未来的投资。