There is a time-lag between theoretical research and practical applications.

理论研究和实际应用之间存在时滞。

《柯林斯英汉双解大词典》

In some agricultural colleges at the present time, young men have to do a year's work on a farm before their theoretical training at college.

在现在的一些农业大学里，年轻人在接受大学的理论培训之前，必须在农场干上一年的活。

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Each of the four fundamental forces (gravity, electromagnetism, and the strong and weak nuclear forces) has a kind of theoretical knob.

四种基本力（万有引力、电磁力、强核力和弱核力）中的每一种都有一个理论上的旋钮。

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You begin to hear, or perhaps smell, the slight whiff of jargon that pervades theoretical writing. It often does so for a reason.

你开始听出，或者嗅出遍布理论文章中的术语的味道,这往往是有道理的。

耶鲁公开课 - 文学理论导论课程节选

The earnings, you understand, are kind of a theoretical concept but dividend is the money that we send out.

你们都知道,收益是个理论概念,但股利是我们分发出去的钱

耶鲁公开课 - 金融市场课程节选

It's here that Milton for no explicit, or no apparent, reason at all - it's here that he provides a little theoretical digression on the stunning flexibility of angelic bodies.

但在这他无缘无故的，没有任何明显原因的,-在这儿他脱离了诗歌主线,转而去描写天使身体惊人的灵活性。

耶鲁公开课 - 弥尔顿课程节选

Instead, when working alone you can treat the assignment as a theoretical exercise, like a B-school case study to turn in to the professor.

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They found what they consider a flaw in the underlying formula: Pearson combined results from the two tests and used a theoretical shortcut to produce a final result.

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"It clearly demonstrates that fast worms are not just a theoretical threat, but a reality - one that should be considered a standard tool in the arsenal of an attacker, " said the experts.

BBC: Aggressive net bug makes history