theory
n. 理论；原理；学说；推测
theory可数名词
例句
The theory remains untested.
该理论仍未经过验证。
The theory has now been disproved.
这一理论现已证明是错误的。
In theory I\'m on call day and night.
理论上，我不分昼夜随叫随到。
The theory does not apply universally.
这个理论并非放之四海而皆准。
And that\'s where the theory falls down.
这就是该理论的不足之处。
