once over lightly

例句：

1. 1. Once upon a time, there was a magical kingdom in the forest.
   从前，森林里有一座神奇的王国。
2. 2. Once in a while, I go to the gym for a workout.
   偶尔，我去健身房锻炼一下。
3. 3. Once you've tried it, you'll never forget the taste of that delicious cake.
   一旦你尝过那美味的蛋糕，就再也不会忘记它的滋味了。