theory
noun
ˈθɪəri
noun
1
an
idea
or
set
of
ideas
that
is
intended
to
explain
something
about
life
or
the
world,
especially
an
idea
that
has
not
yet
been
proved
to
be
true
〔尤指尚未得到证实的〕学说，理论;
C
[+
about/on
]
different
theories
about
how
the
brain
works
关于大脑如何运作的各种学说
[+
of
]
Darwin’s
theory
of
evolution
达尔文的进化论
theory
that
the
theory
that
light
is
made
up
of
waves
光是由波组成的理论
2
general
principles
and
ideas
about
a
subject
〔某一学科的〕理论
U
Freudian
theory
has
had
a
great
influence
on
psychology.
弗洛伊德理论对心理学有着巨大的影响。
political/economic/literary
etc
theory
I’m
taking
a
course
on
political
theory.
我正在修政治理论课程。
3
in theory
something
that
is
true
in
theory
is
supposed
to
be
true,
but
might
not
really
be
true
or
might
not
be
what
will
really
happen
理论上，从理论上来说
In
theory,
everyone
will
have
to
pay
the
new
tax.
理论上讲，每个人都得缴纳这项新税。
4
an
idea
or
opinion
that
someone
thinks
is
true
but
for
which
they
have
no
proof
猜想; 假设
C
theory
that
Detectives
are
working
on
a
theory
that
he
knew
his
murderer.
侦探们假设他认识谋杀他的凶手，并以此展开侦破工作。