形 ordinary，common，constant，invariable；副 （时常； 常常） frequently，often，usually；名 [书]norms，a surname ；

[例句] 你常出汗或是脸上常发烫吗？ Do you sweat a lot or flush a lot?

[例句] 还有一些不太常有的设施，包括图书馆和健身房。 Other amenities, less commonly available, include a library and exercise room.

extraordinary，unusual，very，extremely，highly ；

[例句] 对于这个决定的反应非常不一致。 There has been a very mixed reaction to the decision.

[例句] 我非常同情生活在那些地方的人们。 I clearly empathize with the people who live in those neighborhoods.

unusual，abnormal，extremely，exceedingly，abnormity ；

[例句] 有些段落他演奏得异常徐缓，听上去有些忧伤。 He plays some passages so slowly that they become lugubrious.

[例句] 黑暗中我的听觉变得异常灵敏。 In the dark my sense of hearing becomes so acute.

convention，rule，[医] routine，common practice，a beaten track ；

[例句] 所有新时尚都是从打破现有常规开始的。 All new fashion starts out as a reaction against existing convention.

[例句] 恕我直言，那听起来不太符合常规。 It doesn't sound exactly orthodox, if I may say so.

unusual，abnormal，abnormality，anomaly，deregulation ；

[例句] 海军最高指挥部对这些进展的回应十分反常。 The naval high command's response to these developments is rather curious.

[例句] 那架飞机以反常的速度起飞升空。 The aircraft rose with unnatural speed on take-off.

normal，regular；

[例句] 当然，并不是所有的酗酒者和吸毒者都会生育出不正常的后代。 Of course, not all alcoholics and drug abusers produce deviant offspring.

[例句] 这台仪器可以辨别癌细胞和正常的细胞。 The device can discriminate between the cancerous and the normal cells.

normalcy，habitus，ordinary [constant] state，normality，normal ；

[例句] “国有企业经营不善将是常态，”约翰·穆尔告诉读者。 "State-owned industries will always perform poorly," John Moore informed readers.

[例句] 经过几小时的休息,他们又恢复常态. After a few hours rest they were themselves again.

[数] constant ；

[例句] 绝对常数是固定而不可以改变的. An absolute constant is fixed and can not be changed.

[例句] 高介电常数具有氢键液体的特征. The high dielectric constant is characteristic of hydrogenbonded liquids.

ordinary，common，generally，usually，be all in the day's work ；

[例句] 像平常一样，他们是在厨房吃的饭。 They ate, as they usually did, in the kitchen.

[例句] 在街上看见有人饿晕是很平常的事。 It's commonplace to see people collapsing from hunger in the streets.

usually，in general，customarily，ordinarily；

[例句] 我先挑出了所有通常留到最后的人。 I picked first all the people who usually were left till last.

[例句] 我们得到了通常难以获取的大量数据。 We gained a rich supply of data which would normally be inaccessible.

frequently，often，usually，generally ；

[例句] 学生常常赶数百英里的路来到这里。 Students often travel hundreds of miles to get here.

[例句] 他常常讽刺或挖苦人，有时又会大发雷霆。 He was often caustic and mocking, or flew into rages.

constant (quantity) ；

[例句] 若干研究已经发现了两个重要常量。 Two significant constants have been found in a number of research studies.

[例句] 其值不变的量称为常量. A quantity whose value remains unchanged is called a constant.

often，frequently，(every) now and again，between whiles，sometimes ；

[例句] 他们时常陷入枯燥的日常事务之中。 All too often they become enmeshed in deadening routines.

[例句] 他时常伪装自己。 From time to time he will take on a new persona.

not normal，abnormal，odd，go into a (flat) spin，out of gear ；

[例句] 我不能判定他到底是英勇无畏还是精神失常。 I couldn't decide whether he was incredibly brave or just insane.

[例句] 一些人完全承受不了，结果就精神失常了。 Some people simply can't take it and they just go insane.

general [elementary] knowledge，common sense，nous，general knowledge ；

[例句] 放心吧，他知道的常识很可能比你以为的要多得多。 Rest assured, he probably has rather more common sense than you realize.

[例句] 爱因斯坦敢于抛弃常识和长期公认的理论。 Einstein had the chutzpah to discard common sense and long-established theory.

abnormal，irregular，abnormality ；

[例句] 当然，并不是所有的酗酒者和吸毒者都会生育出不正常的后代。 Of course, not all alcoholics and drug abusers produce deviant offspring.

[例句] 这个想法中有某种不正常的、令人痴迷的东西。 There's something morbidly fascinating about the thought.

（变化不定） variable，changeable，caducity，fleetness，fugacity；

[例句] 这难道不是要求对生命的无常加以控制吗？ Isn't this a demand to control the randomness of life?

[例句] 他的见解反覆无常. He is inconsistent in his views.

as usual ；

[例句] 从那以后他照常出现在办公室，风雨无阻。 He continued to appear in the office with unfailing regularity thereafter.

[例句] 我不在时,请照常干活. Please carry on as usual while I am away.

usualness，used to ；

[例句] 不透露患者病情的细节是惯常的做法。 It is normal practice not to reveal details of a patient's condition.

[例句] 他们讥讽着，喊叫着，打破了惯常的那一分钟沉默。 They interrupted the customary one minute's silence with jeers and shouts.

[植] ivy，Chinese ivy，Hedera Helix，bindwood ；

[例句] 大楼的正面爬满了常春藤。 The front of the building was covered with ivy.

[例句] 爬满常春藤的石墙 stone walls covered in ivy