User needs are the driving force behind our progress.

To understand the meaning of a sentence， we must consider the speaker's intention and the context of the utterance.

长江大海不会和废弃水井比较浊清，九霄的雷霆不会和的青蛙蚯蚓比斗谁的声响响亮。

"The most important thing is to stay optimistic."

基础设施决定论原则认为，基础设施的结构决定了上层建筑的结构。