call forth例句

Great crises often call forth gifted leaders.
危急存亡之际常能产生天才的领袖.

How does spirit of ability call forth do a happy person?
怎样才能振作起精神做个快乐的人?

It occurs when minds stimulate each other and ideas call forth ideas.
当主意相互碰撞、想法相互启发,协同效应就发生了.