theories

英 [ˈθɪəriz]

美 [ˈθɪriz]

n.  学说; 论; 说; 理论; 原理; 原则; (未证明的)意见; 看法; 推测
theory的复数

柯林斯词典

• N-VAR 理论;学说
  Atheoryis a formal idea or set of ideas that is intended to explain something.
  1. Marx produced a new theory about historical change based upon conflict between competing groups...
     马克思创立了一种新理论，认为历史的演变是基于对立集团之间的冲突之上的。
  2. Einstein formulated the Theory of Relativity in 1905.
     爱因斯坦于 1905 年创立了相对论。
• N-COUNT 观点;见解
  If you have atheoryabout something, you have your own opinion about it which you cannot prove but which you think is true.
  1. There was a theory that he wanted to marry her...
     有人认为他想娶她。
  2. My theory about divorce is that it's not the split-up that damages children, it's how it is handled.
     我对离婚的看法是，伤害孩子的不是婚姻的破裂，而是处理离婚的方式。
• N-UNCOUNT (实践科目、技能的)理论基础
  Thetheoryof a practical subject or skill is the set of rules and principles that form the basis of it.
  1. He taught us music theory.
     他教我们乐理。
  2. ...graduates who are well-trained in both the theory and practice of statistics.
     在统计学理论和实践两方面都训练有素的毕业生
• PHRASE 从理论上说;照理说
  You usein theoryto say that although something is supposed to be true or to happen in the way stated, it may not in fact be true or happen in that way.
  1. A school dental service exists in theory, but in practice, there are few dentists to work in them.
     照理说，学校也有牙医诊所，可实际上，里面的牙医寥寥无几。

双语例句

• In scientific research, one should break new paths and not be fettered by accepted theories.
  进行科学研究，不能囿于成说，要敢于创新。
• Such theories are still very tentative.
  这种理论仍然是探索性的。
• This highlights a problem faced by people proposing theories of ball lightning
  这使得球状闪电理论的提出者所面临的一个问题凸显出来。
• There are many theories that claim to be able to predict whether you're carrying a boy or a girl.
  有许多理论声称能够预测胎儿的性别。
• Over the years several similar theories have been put forward
  几年来已经有好几个类似理论相继提出。
• There is no end to searching into philosophical theories.
  对哲理的钩玄永无止境。
• We shall use it as a yardstick in the following brief survey of the theories of static fatigue.
  我们在下面的静态疲劳理论的主要研究中将用它作为一个衡量的尺度。
• Don't let yourself be distracted by fashionable theories
  不要让自己被流行的理论分散了注意力。
• Einstein's theories opened up a whole new field for study.
  爱因斯坦的理论揭开了一个全新的研究领域。
• All our theories sound pretty lame.
  我们的理论似乎全都站不住脚。