习惯用语be caught with chaff1.上当, 受骗offer chaff for grain1.挂羊头卖狗肉chaff and dust1.废物特殊用法active chaff1.有源干扰物black chaff1.小麦黑颖病delayed-opening chaff1.延时打开的金属反射体regenerative chaff1.再生式雷达干扰云rope chaff1.雷达干扰长反射器箔条