The invention of the cotton gin was the result of necessity and observation.

The past is a shadow that never leaves.

The only limit to your success is your own imagination.

世界需要更多的森林，而不是更少。

我不完美，但我正在努力。

Quality is never an accident; it is always the result of intelligent effort.

景观的历史写在它的土壤、植被和地形中。