freeloader
n. 不速之客,揩油的人
If you refer to someone as a freeloader, you disapprove of them because they take advantage of other people's kindness, for example by accepting food or accommodation from them, without giving anything in return.
1. someone who takes advantage of the generosity of others
He's such a freeloader.
他是個吃白食的人。
He'such a freeloader.
他是個吃白食的人.