theory
gb/θˈiɚi/ us/θˈiɚi/
B1
Anh
~ 700
Các nghĩa
0 nghĩa
Danh từ
B2
entity
1
Explanation supported by evidence
An idea that explains why things happen, based on facts and study.
Mẫu sử dụng:
a theory about [something]
Lỗi thường gặp:
Learners sometimes confuse 'theory' with 'hypothesis'. A hypothesis is an idea to be tested; a theory is already supported by evidence.
Từ đồng nghĩa
explanation (More general; can be for everyday situations, not just formal or scientific contexts.)
Từ trái nghĩa
fact (A fact is something known to be true without the need for explanation or hypothesis.)
Cụm từ đi kèm
scientific theory
|develop a theory
|theory suggests
|test a theory
|propose a theory
Chủ đề
science
|education
|research
|core_vocabulary
Ví dụ
- Einstein's theory of relativity changed our understanding of space and time.
- The theory explains how galaxies form.
- Her theory is that the missing money was stolen by someone inside the company.
- The researchers developed a new theory to explain the results.
- According to current theory, the universe began with the Big Bang.
Ví dụ cho người học
- I read about a new theory in science class.
- Her theory is that plants grow faster in sunlight.
- The theory says the earth goes around the sun.
- Scientists have a theory about why animals migrate.
Danh từ
B2
entity
2
General ideas or principles
An idea or set of rules about how something works or should work.
Mẫu sử dụng:
theory of [something]
Lỗi thường gặp:
Learners sometimes use 'in theory' incorrectly to mean 'probably' instead of 'according to the plan or idea'.
Từ đồng nghĩa
principle (Refers to a basic truth or rule; may be more fixed than 'theory'.)
Từ trái nghĩa
practice (Refers to the actual doing of something, as opposed to the ideas about it.)
Cụm từ đi kèm
political theory
|economic theory
|management theory
|in theory
Chủ đề
philosophy
|education
|work
|core_vocabulary
Ví dụ
- In theory, this plan should save the company money.
- She studies political theory at university.
- The new economic theory challenges traditional views.
- According to game theory, players act in their own interest.
Ví dụ cho người học
- In theory, the train should arrive at 8.
- We learned about economic theory in class.
- His theory is that people are happier in small towns.
Danh từ
B1
entity
3
Unproven belief or guess
A guess or idea that might explain something, but is not certain.
Mẫu sử dụng:
have a theory that [clause]
Lỗi thường gặp:
Learners may overuse 'theory' for casual guesses; 'idea' or 'guess' can be more natural in informal speech.
Từ đồng nghĩa
speculation (More formal; often suggests guessing without strong evidence.)
Từ trái nghĩa
certainty (Something known for sure, without doubt.)
Cụm từ đi kèm
have a theory
|my theory is that
|conspiracy theory
Chủ đề
daily life
|communication
|core_vocabulary
Ví dụ
- I have a theory that my neighbor is avoiding me.
- Her theory is that the cat goes out at night to hunt.
- There's a popular conspiracy theory about that event.
Ví dụ cho người học
- I have a theory that it will rain today.
- His theory is that she is tired.
- They talk about a strange conspiracy theory.
Ngữ pháp
Dạng từ điển
theory
IPA
GB/θˈiɚi/
US/θˈiɚi/
Âm tiết và trọng âm
the - ory (2 âm tiết)
Stress on 1st syllable (the)
Các dạng từ
Noun
- Base: theory
- Plural: theories, theory
Họ từ
Forms
theories
noun
Core family
theoretical
adjective B2
theoretically
adverb B2
Cách diễn đạt
conspiracy theory
1/kənspˈɪɹəsi θˈiɚi/
fixed phrase
belief about secret harmful plot
An explanation of an event that says a secret group planned it for a bad reason, usually without good proof.
Ví dụ
- Some people believe the moon landing was a conspiracy theory.
- The internet has made it easier for conspiracy theory videos to reach millions of people.
- The internet has made it easier for conspiracy theories to spread.
- He dismissed the idea that the vaccine is a government plot as a wild conspiracy theory.
- Some conspiracy theory communities moved to new platforms after being banned.
in theory
1/ˈɪn θˈiɚi/
fixed phrase
According to ideas or plans
When something should happen based on ideas or plans, but it might not happen in real life.
Ví dụ
- In theory, this method should work every time.
- In theory, the plan should work perfectly.
- In theory, anyone can apply for the job, but few are qualified.
- In theory, anyone can apply for the job, but in practice it’s very competitive.
in theory
2/ˈɪn θˈiɚi/
fixed phrase
according to theory, not practice
According to ideas or rules of how something should work, not necessarily how it really works.
Ví dụ
- In theory, the new law will reduce traffic, but many people doubt it.
- The plan sounds perfect in theory, but it will be hard to carry out.
- In theory, children learn faster with smaller classes.