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ADJ-GRADED
(眼神、表情或話語)會(huì)意的，心照不宣的
A sly look, expression, or remark shows that you know something that other people do not know or that was meant to be a secret.
例句
His lips were spread in a sly smile...
他心照不宣地咧嘴一笑。
He gave me a sly, meaningful look.
他心照不宣地看了我一眼，意味深長。
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ADJ-GRADED
狡猾的;詭詐的
If you describe someone as sly, you disapprove of them because they keep their feelings or intentions hidden and are clever at deceiving people.
例句
She is devious and sly and manipulative...
她陰險(xiǎn)狡詐，會(huì)玩人。
He's a sly old beggar if ever there was one.
他確確實(shí)實(shí)是個(gè)老奸巨猾的家伙。
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PHRASE
偷偷地
To do something on the sly means to do it secretly, often because it is wrong or bad.
例句
Was she meeting some guy on the sly?
她是不是偷偷地在見什么人？