n.坚定不移；恒久不变；忠诚；【生】恒有度
Constancy in love is a good thing. 爱情能持之以恒才是好事。
The secret of success is constancy of purpose . 成功的秘诀是目标的坚定性。
He admired her courage and constancy. 他钦佩她的勇气和忠贞。
Never doubt the constancy of my love for you. 绝对不要怀疑我对你爱的忠诚。
n.易变；不定性；不忠实
