“Help oneself to sth” 是一个常用的英语短语，意为“随便取用某物（尤指食物或饮料）”，常用于礼貌地邀请他人自取所需。
Please help yourself to some cookies.
请随便吃些饼干吧。
The guests helped themselves to the buffet.
客人们自行取用了自助餐。
Feel free to help yourself to anything in the fridge.
冰箱里的东西随便拿，别客气。
He helped himself to a second slice of cake.
他给自己又拿了一块蛋糕。
You don’t need to ask—just help yourself!
你不用问，尽管自己拿就行！