1
the constancy of sth
强调某事物自身持续不变的性质。
The constancy of the seasons is a comfort to many people.
四季的恒常令许多人感到安心。
持久不变；恒定；坚贞
先理解核心含义，再看它在真实句子里的用法。
持久不变；恒定；坚贞
The quality of being constant, steady, and enduring; faithfulness in action, affection, or purpose; an unchanging quality or characteristic of a person or thing.
The constancy of the seasons is a comfort to many people.
四季的恒常令许多人感到安心。
The quality of being constant; steadiness or faithfulness in action, affections, purpose, etc.
持久且不变或无变化的品质
the quality of being enduring and free from change or variation
An unchanging quality or characteristic of a person or thing.
知觉恒常性:在观察条件变化时,感知对象仍引起相似知觉体验的倾向
(psychology) the tendency for perceived objects to give rise to very similar perceptual experiences in spite of wide variations in the conditions of observation
Her constancy to her old friends impressed everyone.
她对老朋友的忠诚令所有人印象深刻。
AI contextual example
The constancy of the temperature in the lab is important for the experiment.
实验室温度的恒定对实验很重要。
AI contextual example
Through all the difficulties, his constancy never wavered.
面对所有困难，他的坚定从未动摇。
AI contextual example
early mariners relied on the constancy of the trade winds
早期的航海者依赖信风的恒定。
WordNet
强调某事物自身持续不变的性质。
The constancy of the seasons is a comfort to many people.
四季的恒常令许多人感到安心。
强调在某个方面或行为中表现出的稳定或忠贞。
He values constancy in friendships.
他重视友谊中的忠诚。
指对某人或某事的忠诚，常含情感专一之意。
Her constancy to her husband was never questioned.
她对丈夫的忠贞从未受到质疑。
Not this
She is constancy to her husband.
Use this
She is constant to her husband.
constancy 是名词，不能放在 be 动词后作表语来描述人的品质；表示“对某人忠贞/专一”时应用形容词 constant。改成 constant 后句子语法正确，意思不变。
Not this
I admire her consistency in love.
Use this
I admire her constancy in love.
consistency 意为“一致性、连贯性”，不表示感情上的忠贞；constancy 才指“忠诚、专一”。在原句中把 consistency 换成 constancy，即可准确表达“在爱情中忠贞不渝”的意思。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
知觉恒常性（观察条件变化时感知保持稳定的倾向）
Perceptual constancy allows us to recognize a friend's face in different lighting.
知觉恒常性使我们在不同光线下仍能认出朋友的脸。
颜色恒常性（不同光照下颜色感知保持一致的倾向）
Color constancy explains why a white shirt looks white in both sunlight and shade.
颜色恒常性解释了为什么白衬衫在阳光下和阴影里看起来都是白的。
大小恒常性（距离变化时物体大小感知保持不变的倾向）
Size constancy helps a driver judge the distance of an approaching car.
大小恒常性帮助驾驶员判断来车的距离。
目标的坚定不移
Her constancy of purpose carried her through years of difficult research.
她对目标的坚定不移支撑她度过了多年艰难的研究。
坚定地；忠贞不渝地
He served the community with constancy for decades.
他几十年如一日坚定地为社区服务。
成功的秘诀在于对目标的坚定不移。
Disraeli declared that constancy to purpose is the secret of success.
迪斯雷利宣称，对目标坚定不移是成功的秘诀。
哦，坚贞啊，请给我力量！
In Shakespeare's Julius Caesar, Portia calls on constancy to help her control her emotions.
在莎士比亚的《裘力斯·凯撒》中，鲍西娅呼唤坚贞，帮助她控制自己的情绪。
Use constancy naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
记住 constant（恒定）→ constancy（恒常、忠贞）；想象一颗恒星永远不变，对感情也始终如一。
语域：formal 常见场景：formal essays、literary texts、character trait descriptions constancy 指“持久不变”或“忠诚坚定”时，属于较正式、书面化的用语，常用于文学或论述性文本；日常口语中较少见，更普通说法如 steadiness、loyalty。
心理学义项中常用复数形式 constancies，指不同类型的知觉恒常性（如大小恒常性、形状恒常性）。
Dictionary facts from ECDICT, WIKTIONARY.