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

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

HSK 2.0 (2010)	Big5	Gb	Pin	Eng
5		观察	guan1 cha2	to observe/ to watch/ to survey/ to examine/ observation/ view/ perspective/ CL:個\|个[ge4]
6		考察	kao3 cha2	to inspect/ to observe and study/ on-the-spot investigation