窮原竟委

Simplified: 穷原竟委

qióngyuánjìngwěi ㄑㄩㄥˊ ㄩㄢˊ ㄐㄧㄥˋ ㄨㄟˇ

    • to trace a matter to its source and end
    • to investigate thoroughly

Character by character

Sources