"to have a hollow leg" in Chinese (Traditional)
飯量很大像無底洞一樣能喫
Definition
這個表達用來形容某人能喫很多卻不會飽，好像他的腿（或肚子）是空的，可以裝更多食物。
Usage Notes (Chinese (Traditional))
屬於非正式、幽默的說法，主要用於形容兒童、青少年或很瘦但喫很多的人。不是字面意思，不適用於正式場合。常見類似說法有『他一定有個無底洞』。
Examples
My brother has a hollow leg. He eats all the time!
我哥哥**飯量很大**，他一直在喫！
You must have a hollow leg to finish two pizzas by yourself.
你能一個人喫掉兩份披薩，**飯量很大**。
Kids sometimes have a hollow leg and need extra snacks.
孩子有時候**飯量很大**，總需要加餐。
Wow, you really have a hollow leg—where does all that food go?
哇，你真的**飯量很大**——這些食物都去哪裡了？
Every time we go out, Jane proves she has a hollow leg—she never leaves anything on her plate.
每次我們出去，簡都能證明她**飯量很大**——盤子上從不剩飯。
He's so skinny but eats so much—he definitely has a hollow leg!
他那麼瘦卻喫那麼多，真的是**飯量很大**！