Energy independence is not just a goal; it's a necessity for national security.
能源独立不仅仅是一个目标；它是国家安全的必需品。
You have to be willing to sacrifice to get what you want or what you need.
"To understand the world, you must first seek to understand yourself."
数学不是一项观赏性运动；要理解它，必须积极参与其中。
现代国家的创建是一个复杂而困难的过程，需要发展强大的制度。
We are healed of a suffering only by experiencing it to the full.
沙漠之所以美丽，是因为在某个角落藏着一口井。