Natural Way to Get Rid of Sagging Above the Eye By Carole A. Ward Droopy eyelids begin when the fragile layers of skin that surround the eyes thin and lose their elasticity due to age, stress, smoking, dehydration, depression, a diet rich in sugars and other environmental factors.
Examples of principles are descriptive comprehensive and fundamental law, doctrine, or assumption, the normative rule or code of conduct, and the law or fact of nature underlying the working of an artificial device.
Meanwhile, principle is only ever a noun that refers to a rule, law, or general truth (e.g., the rules or principles of mathematics). This video clearly explains the difference between principle and principal: