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》

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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One way of solving this theoretical difficulty is to assume a delay of thousands of years while the solar effects overcome the inertia of the earth's climate.

解决这一理论难题的一种方法是假设太阳效应克服地球气候的惯性时，地球会延迟数千年。

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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。

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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.

WSJ: New York City Gifted-and-Talented Program's Math Is Questioned

"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