This is the 8564th most frequent Chinese word.
theory
"Theory" in Chinese (理论, lǐlùn) refers to a system of ideas intended to explain something.
In this sentence, '理论' (theory) is used in the context of scientific principles that explain observable phenomena.
这个理论解释了物体如何在空间中运动。
This theory explains how objects move in space.
Here, '理论' (theory) is utilized to express a hypothesis or speculation that the speaker has formed.
我有一个理论，认为睡眠不足会导致注意力下降。
I have a theory that lack of sleep leads to reduced attention span.
In this instance, '理论' (theory) refers to abstract knowledge or frameworks used for practical application.