在数学中，提出问题的艺术必须比解决问题更有价值。

Green development is not a multiple-choice question, but a must-answer question. We must unswervingly follow the path of green and low-carbon development.

最可持续的采石场是能够平衡生产和环境管理的采石场。

A forest without diversity is like a library with only one book.

为祖国而死是如此值得的命运，以至于所有人都为如此美好的死亡而竞争。