upon the sly

• 秘密地； 偷偷摸摸地

upon the sly的用法和样例：

例句

1. Many people attended the meeting on the sly.
   许多人秘密地参加了会议。
2. They decided to leave the town secretly.
   他们决定秘密地离开这个城镇。
3. Now they wouldn't have to socialize on the sly.
   现在他们不必偷偷摸摸地进行社交交往了。
4. He prowled through the house like a familiar ghost.
   他就象识途的幽灵一样，偷偷摸摸地在房子里走来走去。