never hesitate 毫不犹豫；从不犹豫；不犹豫

【例句】
I always turn to you and you never hesitate to help.
你们总能在我求助时毫不犹豫的给予帮助。

She did not hesitate to join the volunteer organization.
她毫不犹豫地参加了志愿者组织。