frontier
noun
ˈfrʌntɪə
noun
1
the
border
of
a
country
国界，边境
C | especially BrE
[+
between/with
]
Lille
is
close
to
the
frontier
between
France
and
Belgium.
里尔靠近法比边境。
on/at
the
frontier
Troops
established
a
road
block
on
the
frontier.
军队在边境设立了一个路障。
frontier
town/area/post
etc
2
the frontier
an
area
where
people
have
never
lived
before,
that
not
much
is
known
about,
especially
in
the
western
US
before
the
20th
century
〔尤指 20 世纪前美国西部的〕边远地区，荒野地区; 边疆
a
novel
about
a
family’s
struggle
on
the
American
frontier
描写一家人在美国边远地区奋斗的小说
space,
the
final
frontier
太空，最后的前沿
3
the frontiers of knowledge/physics etc
the
limits
of
what
is
known
about
something
知识/物理学等的新领域
push
back
the
frontiers