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1·He has to visit them on the sly.

他只得偷偷地去看望他们。《牛津词典》

2·Under the cover of the smog, He snatched the pot on the sly.

在烟雾的掩护下，他偷偷地拿走了那只壶。

3·Some boys smoke on the sly.

有些男孩子暗地吸烟。《新英汉大辞典》

4·Some officials claimed to unhook connections with the companies but still maintained close ties on the sly.

某些干部口称已跟公司脱钩， 可暗中仍然保持联系。《新英汉大辞典》

5·I've tipped you a wink or signalled to you on the sly many times, but before you took the hint others had already noticed.

我多次向你使眼色，又给你递暗号，别人都明白了，你却没有反应。《新英汉大辞典》

6·She often writes to Peter on the sly.

她经常秘密地给彼得写信。

7·To meet you in this way, on the sly?

就这样子与你秘密相会？

8·The small boy often smoked on the sly.

那个小男孩暗地里经常抽烟。

9·Many people attended the meeting on the sly.

许多人秘密地参加了会议。

10·So some men may feel the need to prove their on the sly.

因此一些男人偷偷的感到需要去证明一下自己的男子气概。