Definition
Describes something that can be done very easily.
易如反掌
For this experienced chef, making this dish is like standing on their head.
对于这位经验丰富的厨师来说，做这道菜就像倒立一样容易。
He could solve this problem in no time; it's like standing on his head for him.
他能够很快解决这个问题；对他来说就像倒立一样容易。
My sister is so good at math; solving these equations is like standing on her head for her.
我妹妹数学很好；解这些方程式对她来说就像倒立一样容易。