aesthetics (US also es-)

n [sing v] branch of philosophy dealing with the principles of beauty and artistic taste 美学（哲学中的一门学科, 研究美和艺术鉴赏的原理）.

aeration, aerial, aerie, aero-, aerobatic, aerobatics, aerobics, aerodrome, aerodynamic, aerodynamics, aeronautics, aeroplane, aerosol, aerospace, aesthete, aesthetic, aesthetically, aesthetically (US also es-), aestheticism, aesthetics, aetiology (US also etiology), afar, affability, affable, affably, affair, affect, affect to, affectation, affected, affecting moving or touching, affectingly, affection, affectionate, affiance, affidavit, affiliate, affiliation, affiliation order, affinity,