parasite

1. N-COUNT A parasite is a small animal or plant that lives on or inside a larger animal or plant, and gets its food from it. 寄生蟲; 寄生植物

Kangaroos harbour a vast range of parasites. 袋鼠身上有各種各樣的寄生蟲。

2. N-COUNT If you disapprove of someone because you think that they get money or other things from other people but do not do anything in return, you can call them a parasite. 靠他人為生的人; 寄生蟲[表不滿]

...a parasite, who produced nothing but lived on the work of others. …一個什么都不做而靠他人的勞動為生的寄生蟲。