Mén / kǒu / tiē / zhe / yì / zhāng / wú / tóu / gào / shi / méi / rén / zhī / dào / shì / shéi / xiě / de

门口贴着一张无头告示，没人知道是谁写的。

An anonymous notice was posted at the entrance, and no one knew who had written it.