Tīngdào / zhège / yìwài / de / xiāoxi / tā / yìshí / wǎngrán / bù / zhīdào / gāi / shuō / shénme

听到这个意外的消息，他一时惘然，不知道该说什么。

On hearing the unexpected news, he was momentarily bewildered and did not know what to say.