她运气这么好，真是令人难以置信。

It's ___unbelievable how lucky she's been.

你运气这么差，真是难以置信。

You've had such bad luck - it's ___unbelievable.

食物好得难以置信，我肯定你会喜欢的。

The food is ___unbelievable and I'm sure you'll love it.