by the sly

• 秘密地；暗地里；偷偷地

by 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. She must have been having lessons on the sly.
   她准是暗地里一直在上课。
4. He's married but he has a girl friend on the side.
   他虽有妻室，但暗地里还有一个女朋友。
5. The child had been spirited away during the night.
   那孩子在夜里被偷偷地带走了。
6. The two lovers meet only by stealth.
   那两个情人只是偷偷地会面。