1. But the worst happened when Rich criticized my mother's cooking, and he didn't even have a clue about what he had done.
    最糟的是当他批评我妈妈的烹饪手艺时，他对自己做的事还一点也没有感觉到。

2. The police have no clue to his identity.
    警察没有任何线索可以确定他的身份。

3. After hearing my story they said there might be some clue in the name Kin-tay.
    听完了我的故事后，他们说肯泰这个名字也许有一些线索。