Thermonuclear reactions are the source of the sun's energy.

He is a veteran warrior who has overcome any difficulties.

He showed a splendid play in the final match.

This war is likely to become a war of attrition.

The use of nuclear bombs is one of the greatest threats to mankind.

His test score was zero.

Rei, where are you going today?

This character is in the shape of '隶', which means 'to extend'.

He is my best companion.

He started working immediately upon receiving an order from his boss.