Word · CEFR B2 · Frequency #1915
constant
不变的；恒定的
核心释义
Unchanging in nature or through time; permanent.
- 1.
在时间或空间中不变的；永恒的
Unchanged through time or space; permanent.
- 2.
随时间持续反复出现的；持久的
Consistently recurring over time; persistent.
- 3.
在目的、行动、情感等方面稳定的
Steady in purpose, action, feeling, etc.
- 4.
恒定不变的
unvarying in nature
- 5.
坚固的；固体的；非流体的
Firm; solid; not fluid.
- 6.
有常数上界的
Bounded above by a constant.
持续不断的；反复发生的；坚定的；忠贞的；坚实的；固体的；有常数上界的；常数有界的；在时间或空间中不变的；永恒的
用法In use
The temperature in the lab is kept at a constant 25 degrees Celsius.
用法提示：这里'constant'作为形容词，修饰'temperature'，表示'恒定的'。
She received constant support from her family during her studies.
用法提示：这里'constant'作为形容词，修饰'support'，表示'持续不断的'。
The machine requires constant maintenance to operate efficiently.
用法提示：这里'constant'作为形容词，修饰'maintenance'，表示'持续的'。
maintained a constant temperature
constant + noun
She was under constant pressure to perform.
她一直承受着持续的压力。
be constant
相关词与表达Connections
搭配Collocations
- constant attention
- 持续的关注
- The project requires constant attention.这个项目需要持续的关注。
- constant reminder
- 不断的提醒
- This scar is a constant reminder of the accident.这个伤疤是那场事故的不断提醒。
- constant source
- 持续的来源
- The sun is a constant source of energy.太阳是持续的能量来源。
- constant companion
- 忠实的伙伴
- Dogs are known as man's constant companion.狗被认为是人类忠实的伙伴。
- constant pressure
- 持续的压力
学习提示Learner notes
记忆技巧Memory Tip
constant 谐音‘康斯坦’，联想为一直保持不变。
语境与语域Context & Register
表示“持续不断”的义项，语域混合，多用于描述时间或数量上的不变状态，常见于科学、日常等场景。
发音与拼写Pronunciation & Spelling
These words share the spelling ending '-ant' but have different vowel sounds in the stressed syllable. None are genuine rhymes with 'constant' (e.g., 'instant' and 'distant' have /ɪ/ instead of /ɒ/).
高价值词汇High-value vocabulary
该词属于 Oxford 核心词汇，值得优先掌握常见搭配和句型。
用法优先级Usage priority
Collins 词频等级为 4，建议结合例句记忆，而不是只背中文释义。
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Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.