qīng chu
clear
distinct
to understand thoroughly
to be clear about
bù qīng chu
unclear
not understood
currently unknown
mù qián hái bù qīng chǔ
at present it is still unclear ....
kǒu chǐ qīng chu
clear diction
clear articulation
tóu nǎo qīng chu
lucid
clear-headed
sensible