rat [ræt]

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n.鼠，卑鄙的人，变节者；vi.背叛，捕鼠；vt.弄蓬松，告发

a small rodent, larger than a mouse , which has a long tail and is considered to be harmful

The rat is hated by many people. 老鼠被很多人憎恶。
He stopped up the rat holes. 他塞住了那些老鼠洞。