yī qīng èr chǔ
to be very clear about sth (idiom)
一
yī
one
清
qīng
(of water etc) clear; clean
二
èr
two
楚
chǔ
abbr. for Hubei 湖北省[Hu2 bei3 Sheng3] and Hunan 湖南省[Hu2 nan2 Sheng3] provinces together
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