突如其来的大暴雨是热带季风季节的典型特征。

The sudden, heavy downpours are ___characteristic of the tropical monsoon season.

带着他特有的守时作风，他准时到达了会议现场。

With his ___characteristic punctuality, he arrived at the meeting exactly on time.

无限的乐观常被视为青年人的典型特质。

A boundless optimism is often seen as a ___characteristic trait of youth.