They ventured out on the rough sea to rescue the victims.

他们冒险到波涛汹涌的海上去救遇难者。

venture,作名词时表示冒险，冒险行为;作动词时表示冒险。

The children ventured out on the thin ice and fell through.

孩子们冒险踏上薄冰,结果掉了进去。

venture作动词时也有敢于的意思，如：

No one ventured to speak to him.

无人敢跟他讲话。