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constant

adjective
 OPAL W
🔊/ˈkɒnstənt/
🔊/ˈkɑːnstənt/
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  1.  
     [usually before noun] happening all the time or repeatedly连续发生的；不断的；重复的
    • There were constant interruptions.一直有中断。
    • a constant stream of visitors all day整天络绎不绝的游客
    • The ruined buildings serve as a constant reminder of the war.损毁的建筑物不断提醒人们战争。
    • The constant threat of violence from the other inmates was hard to deal with.来自其他囚犯的持续的暴力威胁很难应对。
    • Doctors are under constant pressure to treat more and more patients.医生承受着不断增加的压力来治疗越来越多的患者。
    • Babies need constant attention.婴儿一刻也离不开人。🔊🔊
    • This entrance is in constant use.此入口经常使用。🔊🔊
    Extra Examples
    • He is very ill and needs constant attention.他病得很重，需要寸刻不离的照顾。
    • Her constant chatter was beginning to annoy him.她无休止的唠叨开始使他心烦。
    • Her daughter is a constant source of worry to her.她的女儿总是让她忧心。
    • I have been in constant pain since the accident.自事故以来，我一直痛苦不已。
    • It was a constant battle to avoid bankruptcy.为避免破产，这是一场持续不断的战斗。
    • She still has constant nightmares.她仍然经常做噩梦。
    • The business world is one of constant change.商业世界是不断变化的之一。
    • The old buildings are in constant need of repair.这些老建筑不断需要维修。
    • The vehicles were in constant use.这些车辆一直在使用。
    Oxford Collocations Dictionaryverbs
    • be
    • remain
    • stay
    • …
    adverb
    • fairly
    • reasonably
    • relatively
    • …
    preposition
    • across
    • over
    See full entry
  2.  
     that does not change 不变的；固定的；恒定的
    • The car was travelling at a constant speed of 50 mph.汽车以50英里/小时的恒定速度行驶。
    • The samples need to be stored at a constant temperature.这些样本需要在恒温下保存。
    • Crime levels remain constant.犯罪率保持不变。
    • Ross was his most constant and loyal friend.罗斯是他最坚定和忠诚的朋友。
    Extra Examples
    • All variables except one must be held constant.除了一个变量以外，其他所有变量必须保持恒定。
    • Prices have remained constant over this period.价格在这一时期保持不变。
    • The level of unemployment remains fairly constant at around 10%.失业率一直维持在 10% 左右，比较稳定。
    • The temperature must be kept constant.温度必须保持不变。
    • These electrical properties are virtually constant across a wide range of temperatures.这些电性能在很大温度范围内几乎保持不变。
    • These figures were virtually constant across the 1991 and 2001 censuses.这些数字在1991年和2001年的人口普查中实质上没有变化。
    Oxford Collocations Dictionaryverbs
    • be
    • remain
    • stay
    • …
    adverb
    • fairly
    • reasonably
    • relatively
    • …
    preposition
    • across
    • over
    See full entry
    3. Word Originlate Middle English (in the sense ‘staying resolute or faithful’): from Old French, from Latin constant- ‘standing firm’, from the verb constare, from con- ‘with’ + stare ‘stand’. The noun senses date from the mid 19th cent.

constant

noun
OPAL W
🔊/ˈkɒnstənt/
🔊/ˈkɑːnstənt/
(specialist)
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  1. a number or quantity that does not vary常数；常量
    • fundamental physical constants基本物理常数
    opposite variableTopics Scientific researchc2
    Word Originlate Middle English (in the sense ‘staying resolute or faithful’): from Old French, from Latin constant- ‘standing firm’, from the verb constare, from con- ‘with’ + stare ‘stand’. The noun senses date from the mid 19th cent.