At present, there are two academic opinions to this point: Positive Theory and Negative Theory, and the mainstream is the latter.

目前学术界对此有肯定说和否定说两种观点，但主流观点对不动产善意取得是持否定态度的。

youdao

The economic regulation has evolved from three stages:normative analysis as a positive theory, the capture theory and economic theory of regulation.

经济学意义上的规制已经成为经济学的一个非常正式的研究领域。

youdao

This is Seligman's PERMA theory: Positive Emotion; Engagement; Relationships; Meaning; and Accomplishment.

这是塞利格曼的层压理论：积极情感、参与、关系、意义、和成就。

youdao

And it focuses on the theory and the application of positive psychology in various professional domains.

教学重点放在,积极心理学理论,及在各行各业的应用。

哈佛公开课 - 幸福课课程节选

I call this the broaden-and-build theory of positive emotions because positive emotions appear to broaden people's momentary thought action repertoire and build the enduring personal resources.

我称其为积极情绪的扩建理论,因为积极情绪似乎能扩展人们的瞬间想法,和动作指令库并建立持久的个人资源。

哈佛公开课 - 幸福课课程节选

Because, of course, if you're a modest, if you accept the modest version of the valuable container theory, then if the contents get bad enough, that can outweigh the positive value of life.

因为如果你是个保守者，如果你接受保守价值容器理论，那么如果生活内容极为糟糕，它便超越了活着的正数。

耶鲁公开课 - 死亡课程节选

And one of my favorites, the Volkswagen fun theory, inspired some positive social re-engineering by using play as the motivator to behavior change.

FORBES: Big Brand Gestures Make a Splash in Cannes

In theory these are all positive things.

FORBES: Ethanol Isn't Worth Costlier Corn Flakes And Tortillas

In theory, currencies of countries with a positive balance of trade are those that appreciate.

FORBES: Trade Currencies Like Soros