kāi / huì / shí / tā / yì / zhí / bù / hēng / bù / hā / shuí / yě / bù / zhī / dào / tā / de / xiǎng / fǎ

开会时他一直不哼不哈，谁也不知道他的想法。

He stayed silent throughout the meeting, so no one knew what he was thinking.