洞穿

洞穿	dòng chuān	to penetrate / to pierce / to see clearly / to have an insight into
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)
穿	chuān	to bore through; to pierce; to perforate / to go through (e.g. a tunnel); to cross (e.g. a street) / to thread; to string together / to wear; to put on (clothes, shoes etc.) / verb complement indicating thoroughness or completion