理论必须联系实际，我们应当经常记住这一原则。
We should always keep in mind the principle that theory must be integrated with practice.
理论必须密切联系实际是我们应当经常牢记的一条原则。
That theory must go hand in hand with practice is what we should always keep in mind.
理论必须密切联系实际是我们应当经常牢记的一条原则。
That theory must go hand in hand with practice is what we should always keep in mind.
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