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high alert, strict guard
The police are on high alert for the threat of terrorism.
to maintain a strict guard
The police were maintaining a strict guard at the scene of the demonstration.
testimony
His testimony was decisive in the trial.
to testify
He testified in court about what he saw.
Po valley (large plain in northern Italy)
The Po Valley is a large plain in northern Italy.
decline; decrease (especially of desires, strength, etc.)
The decline of the economy is affecting the entire country.
to decline; to decrease (especially of desires, strength, etc.)
His eyesight is declining year by year.
Changwon (South Korea)
Changwon is a beautiful city in South Korea.
origin, source
It is very interesting to explore the origin of this tradition.
(trigonometry) cosine
Do you remember the formula to calculate the cosine, which is one of the trigonometric functions?
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