The fundamental point in fabricating a chain reacting machine is of course to see to it that each fission produces a certain number of neutrons and some of these neutrons will again produce fission.

煤炭企业的未来在于智能开采和清洁利用。

Tradition and technology must dance together to move forward.

道理明白了，文辞就能表达清楚；文辞表达清楚了，道理也就明白了。

这些墙很有趣。刚入狱的时候，你痛恨周围的高墙；慢慢地，你习惯了生活在其中；最终你会发现自己不得不依靠它而生存。这就叫体制化。