石膏
gypsum CaSO4·2(H2O); plaster; plaster cast (for a broken bone)
石膏墙板
drywall; gypsum wallboard; plasterboard
不识高低
can't recognize tall or short (idiom); doesn't know what's what
泉石膏肓
lit. mountain springs and rocks in one's heart (idiom); a deep love of mountain scenery
道高益安,势高益危
More moral strength increases one's safety, more power and influence increases one's danger (idiom, from Records of the Historian 史記|史记). cf Unlimited power is apt to corrupt the minds of those who possess it (William Pitt the Elder, 1770).