1 Old HSK word(s): 
☊钻研 ** B
Definitions from Unihan Copyright © 1991-2015 Unicode® Inc. All rights reserved.
钻 drill, bore / pierce / diamond
研 grind, rub / study, research
Hsk Characters:
HSK -Characters and beyond:
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Korean:
1 NHSK word(s): 钻研* 6 zuan1 yan2to study meticulously/ to delve into
KOREAN6000 word(s):
0 KOREAN 2500 New HSK words):
0 KOREAN Sentence(s):
