Englishfor English speakers
theoretical
Adjective
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Theoretical is about theory rather than its practical application.
Entanglement is important but difficult to study, both in terms of a theoretical understanding and doing experiments.
evidence
Noun
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Evidence is facts or observations that support an idea.
The gun is evidence that professor Pickle killed Mr. Mustard.
If there is clear evidence for lying, he/she should be punished.
The police are still seeking evidence to find out who the murderer is.
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In a courtroom, evidence refers to anything that is shown to the judge that is related to the case during a trial.