怎一个愁字了得

zěn yī gè chóu zì liǎo dézenyigechouziliaode

1. (last line of the poem 聲聲慢|声声慢[Sheng1 sheng1 Man4] by Song poet Li Qingzhao 李清照[Li3 Qing1 zhao4])
2. how can it be expressed in one word, "sorrow"?
3. how can words express such sadness?

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