Thinking is behavior. The muscular habits learned in overt speech are responsible for implicit or internal speech (thought).

解释：情绪变化会影响身体生理反应，如贪心时口水增多，悲哀时流泪，体现了情绪与健康的关联。

La puissance ne consiste pas à frapper fort ou souvent, mais à frapper juste.

The United States, in their expansive capacity, are capable of containing within their limits the whole population of the earth.

避免麻烦的最大方法之一就是保持简单......系统经常会失控。