We found a rat in the kitchen and need to buy some traps immediately.

rat 的意思是"老鼠"，特指体型较大、尾巴细长的啮齿类动物，常生活在人类居住区附近。 traps 是名词 trap 的复数形式，trap 指"陷阱、捕捉装置"，在这里特指"捕鼠器"。