You cannot have your cake and eat it too.

鱼与熊掌，不可得兼。

youdao

You'll soon certainly have your cake and eat it too.

当然，你很快也会有蛋糕供自己享用。

youdao

There is a proverb that says you can’t have your cake and eat it too.

有一句谚语是这样说的：鱼与熊掌不可兼得。

youdao

For example, if the activity is an S corporation, you can have your cake and eat it too.

FORBES: Overview Of The New 3.8% Investment Income Tax, Part 2: Passive Activities

Expecting to slide into the same place you left years later is wanting to have your cake and eat it too.

FORBES: Why Is Military Active Duty, "Serving Our Country," But Parenting Active Duty, "Opting Out"?

But the basic argument is the same: supporters of Scottish independence are suggesting you can have your cake and eat it too.

BBC: Scotland: Treasury wants a pound for a pound