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1 (wiktionary) 2 (zh.wikipedia) 3 (en.wikipedia) 4 (glosbe)

Compounds Expand your vocabulary by studying more complex words built by the 'core words'.

CORE WORDS

HSK 1.0 (1992)	Big5	Gb	Pin	Eng

HSK 2.0 (2010)	Big5	Gb	Pin	Eng
4		调查	diao4 cha2	investigation/ inquiry/ to investigate/ to survey/ survey/ (opinion) poll/ CL:項|项[xiang4];個|个[ge4]
6		审查	shen3 cha2	to examine/ to investigate/ to censor out/ censorship
6		查获	cha2 huo4	to investigate and capture (a criminal)/ to ferret out/ to hunt down and arrest
6		探讨	tan4 tao3	to investigate/ to probe

HSK 3.0 (2022)	Big5	Gb	Pin	Eng
3	調	调	diào	to transfer, to move (troops or cadres), to investigate, to enquire into, accent, view, argument, key (in music), mode (music), tune, tone, melody, to harmonize, to reconcile, to blend, to suit well, to adjust, to regulate, to season (food), to provoke, to incite
6	調研	调研	diàoyán	to investigate and research, research, investigation
6	追究	追究	zhuījiū	to investigate, to look into
7	查處	查处	cháchǔ	to investigate and handle (a criminal case)
7	查明	查明	chámíng	to investigate and find out, to ascertain
7	檢察	检察	jiǎnchá	to inspect, (law) to prosecute, to investigate
7	探求	探求	tànqiú	to seek, to pursue, to investigate
7	偵察	侦察	zhēnchá	to investigate a crime, to scout, to reconnoiter, reconnaissance, detection, a scout
7	追問	追问	zhuīwèn	to question closely, to investigate in detail, to examine minutely, to get to the heart of the matter