I eat lunch at twelve o'clock.

This diode only allows current to flow in one direction.

My younger sister is twenty-one years old.

He trains his biceps at the gym every day.

His speech was full of hendiadys expressions, which captivated the listeners.

Our project is scheduled to be completed on the twentieth day of the month.

Double dipping is a breach of etiquette.

This game is really fun from the second playthrough.

Redistribution of this software is prohibited.

It seems that he is suffering from chuunibyou.