doubly

You must be doubly careful when driving on icy roads during a snowstorm.

(Chinese) 在暴风雪期间在结冰的路面上行驶，你必须加倍小心。

He felt doubly happy because he won the gold medal and broke the world record.

(Chinese) 他感到双倍的快乐，因为他赢得了金牌并打破了世界纪录。