n.易變；不定性；不忠實
Constancy in love is perpetual inconstancy, inasmuch as the heart is drawn to one quality after another in the beloved, now preferring this, now that. 愛所恒定不變的是它永恒的易變，因為心被心愛人一個接著一個的特質(zhì)所吸引，一會兒更喜歡這個，一會兒又更喜歡那個。
