我不是因为快乐而唱歌,我因为唱歌而快乐。
I don't sing because I'm happy; I'm happy because I sing.
Quality is the lifeline of an enterprise, and it should never be compromised.
历史不是过去,而是现在。我们随身携带着历史。
The balance between economy and ecology is the core of modern forestry.