rat（名词）：老鼠；鼠类，常指体型较大的鼠。口语中也可指告密者/叛徒（较贬义）。
/t/
A rat ran across the kitchen floor.
一只老鼠跑过了厨房地板。
He was accused of being a rat who betrayed his friends to the police.
他被指责是个向警方出卖朋友的告密者。
rat 来自中古英语 ratte，与多种日耳曼语词形相关，最初主要指这种啮齿动物；后来在英语俚语中引申出“告密者、背叛者”的含义。
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