Mucosal immunity plays a crucial role in protecting our bodies from pathogens.

He swore to protect that secret even at the cost of his life.

He had a narrow escape in that accident.

I can't solve this problem because there are too many numbers.

Please proceed one by one in order.

He made a long journey to visit the king.

Atsushi is good at chess.

Etsuko went to pick up the child.

He decided to discard unnecessary things.

He settled the issue immediately.