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- 理论上是如此。
It is so in theory.
- 那个理论的精髓是为人民服务。
The pith of that theory is serving for people.
- 这种理论与已知事实不符。
This theory is at variance with the known facts.
- 老教授主持了一次理论物理学家的研讨会。
The old professor had presided over a seminar for theoretical physicists.
- 这是一种理论上的可能性，但我认为这种情况不会发生。
It's a theoretical possibility, but I don't suppose it will happen.
- 这本书理论性太强，我需要一本实用的。
This book is too theoretical; I need a practical one.
- 这样他们就能更好地把理论运用到实践中去。
In this way they can better apply theory to practice.
- 终于在一六八七年他发表了他的新理论。
Only in 1687 did he at last publish his new theory.
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