写文章必须追溯六经的源头，并参考诸子百家和史书的写法。
The environment shapes behavior through the mechanism of reinforcement.
The double helix structure of DNA is one of the most beautiful and elegant structures in all of science.
"In every word, there is a world waiting to be discovered."
Success in the aggregates industry is not just about moving rocks; it's about moving the economy forward.