on the sly造句

1、He's been drinking whiskey on the sly for thirty years.
他暗中偷喝威士忌葡萄酒已有三十年了。

2、He drives his mother's car on the sly while she's out at work.
在他母亲出去工作时，他偷偷开了她的汽车。

3、I believe that Malcolm is meeting his secretary on the sly after work.
我敢确实马尔科姆下班后要和他的秘书幽会。