underhand single stope

例句：

1. 1. He tried to hide the truth from his boss by using an underhand approach.
   他试图通过一种秘密的方式向老板隐瞒真相。
2. 2.The thief used an underhand way to steal the valuable items.
   小偷用一种秘密的方式偷走了那些贵重的物品。
3. 3. She worked underhand to get her project approved.
   她秘密地工作，以获得她的项目的批准。