This eigenfunction is one of the fundamental concepts of quantum mechanics.

I often go to the cinema on weekends.

His face was full of happiness.

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He pushed the door open with his hand.

He tied the luggage tightly with twine.

He published his own collection of poems.

He likes to go around the park every day.

This old radio uses a cold-cathode tube.

It is said that secondhand smoke has a negative impact on health.