探 ㄊㄢ ˋ tàn 骊 ㄌㄧ ˊ lí 得 ㄉㄜ ˊ dé 珠 ㄓㄨ zhū 探 ㄊㄢ ˋ tàn 驪 ㄌㄧ ˊ lí 得 ㄉㄜ ˊ dé 珠 ㄓㄨ zhū to pluck a pearl from the black dragon (idiom, from Zhuangzi); fig. to pick out the salient points (from a tangled situation) to see through to the nub