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, a county in Shanxi
穿	chuān	to wear / to put on / to dress / to bore through / to pierce / to perforate / to penetrate / to pass through / to thread