买 ㄇㄞ ˇ mǎi 椟 ㄉㄨ ˊ dú 还 ㄏㄨㄢ ˊ huán 珠 ㄓㄨ zhū 買 ㄇㄞ ˇ mǎi 櫝 ㄉㄨ ˊ dú 還 ㄏㄨㄢ ˊ huán 珠 ㄓㄨ zhū to buy a wooden box and return the pearls inside to show poor judgment (idiom)