n.堅(jiān)定不移；恒久不變；忠誠；【生】恒有度

Constancy in love is a good thing. 愛情能持之以恒才是好事。

The secret of success is constancy of purpose . 成功的秘訣是目標(biāo)的堅(jiān)定性。

He admired her courage and constancy. 他欽佩她的勇氣和忠貞。

Never doubt the constancy of my love for you. 絕對(duì)不要懷疑我對(duì)你愛的忠誠。

n.易變；不定性；不忠實(shí)