耕當問奴，織當訪婢 [－当问－－织当访－]
Jyutping
gaang1 dong1 man6 nou4 , zik1 dong1 fong2 pei5
Pinyin
gēng dāng wèn nú , zhī dāng fǎng bì
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if it's plowing ask the laborer, if it's weaving ask the maid (idiom); when managing a matter, consult the appropriate specialist