constancy
音标：
英音/ ˈkɒnstənsi / 美音/ ˈkɑːnstənsi /
听听基本释意：
外刊例句：
Every human being longs for love and constancy, and you will find it — but likely not with your mother.
每个人都渴望爱和忠诚，你会找到它——但你的母亲可能不会。
—Washington Post
Of course, the constancy of the seasons these days can’t be taken for granted as in the past.
当然，现在不能像过去那样认为季节的恒定是理所当然的。
—Washington Times
Such constancy despite changing circumstances is not necessarily a good sign.
尽管环境不断变化，但这种坚定不移不一定是一个好兆头。
—New York Times
基本释意：
noun
the quality of being enduring and free from change or variation
坚定不移；恒久不变
同义词：
stability,perceptual constancy
短释义：
Have you ever noticed how some people change their minds every day? Someone like that isn’t showing constancy. In parts of the world where the weather changes frequently, the weather has no constancy, whereas in San Francisco, where it’s about 70 and mild for ten months of the year, the weather has constancy. If you take constancy — a good thing — too far, you have stubbornness — an undesirable quality.
永远不会改变的事物或人，会保持不变，这更像是一块岩石，而不是风中飘扬的树叶，显示出坚定不移。
长释义：
Have you ever noticed how some people change their minds every day? Someone like that isn’t showing constancy. In parts of the world where the weather changes frequently, the weather has no constancy, whereas in San Francisco, where it’s about 70 and mild for ten months of the year, the weather has constancy. If you take constancy — a good thing — too far, you have stubbornness — an undesirable quality.
你有没有注意到有些人每天都在改变主意？这样的人没有表现出坚定的态度。在世界上天气变化频繁的地区，天气没有恒定性，而在旧金山，一年中十个月的气温约为 70 度，气候温和，但天气却有恒定性。如果你太过于坚持不懈——这是一件好事——那么你就会变得固执——这是一种不受欢迎的品质。
文学例句：
Jack then demands his half of Delia, refuses to take her whole, and, when Eumenides prepares to cut her in twain, explains that he has asked this only as a trial of constancy.
然后杰克要求得到他的一半迪莉娅，但拒绝接受她的整个，当尤美尼德斯准备将她切成两半时，他解释说他提出这一要求只是为了考验他的坚定性。
—The Grateful Dead
The History of a Folk Story by Gerould, Gordon Hall
Alas, alas! the constancy and resolution of youth, what frail things they are! and how fast the ephemeral feelings and purposes of the hour give place to others as frail and vain!
唉，唉！青春的坚毅和决心，是多么脆弱啊！此时此刻短暂的感情和目的是多么迅速地让位于脆弱和虚荣的其他感情和目的！
—The Gipsy (Vols I & II)
A Tale by James, G. P. R. (George Payne Rainsford)
But while there is thus conservation or constancy of amount of energy in an isolated and finite material system, this energy may to residents on the system become unavailable.
但是，尽管在孤立且有限的物质系统中存在能量守恒或恒定，但该能量可能对系统上的居民变得不可用。
—Lord Kelvin
An account of his scientific life and work by Gray, Andrew
词源：
constancy (n.)1520s, “fixedness or firmness of mind,” a fuller form of constance (q.v.) with abstract noun suffix -cy. Meaning “faithfulness, fidelity” (to a person or cause) is from 1540s; that of quality of immutability, a permanent state” is from c. 1600.Related entries & more
下面是词源的翻译（机器翻译比较难翻，参考着看）
constancy (n.)1520 年代，“思想的坚定性或坚定性”，constance (qv) 的更完整形式，带有抽象名词后缀 -cy。意思是“忠诚、忠诚”（对一个人或事业）来自 1540 年代；不变性的质量，永久状态”来自约 1600 年。相关条目及更多
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