An old bird is not to be caught with chaff

一个经验丰富的人不会轻易上当

Chaff是谷物的皮壳，即糠，有时用糠来引雀鸟上钩，但一只老雀（old bird）是不会轻易上钩的。这成语比喻那些有经验的人（old bird）不会轻易受骗。The suspects tried to lie to Inspector Luo but they were seen through immediately.Inspector Luo has years of experience in the PoliceForce and an old bird is not to be caught with chaff!那些嫌疑犯企图欺骗罗督察，但罗督察经验丰富，又怎会这么容易被骗过呢！