洞鉴

洞鉴	dòng jiàn	to examine deeply / to inspect closely
洞	dòng	cave / hole / zero (unambiguous spoken form when spelling out numbers) / CL:个
洞	tóng	used in 洪洞 (the name of a place in Shanxi)
鉴	jiàn	variant of 鉴
鉴	jiàn	old variant of 鉴
鉴	jiàn	bronze mirror (used in ancient times) / to reflect / to mirror / sth that serves as a warning or a lesson / to examine / to scrutinize
鉴	jiàn	variant of 鉴