tropic
noun
ˈtrɒpɪk
noun
1
one
of
the
two
imaginary
lines
around
the
world,
either
the
Tropic
of
Cancer
which
is
23
1
/
2
˚ north of the EQUATOR, or the Tropic of Capricorn which is 23 1/ 2˚ south of the equator〔赤道以北或以南的〕回归线
C
2
the tropics
the
hottest
part
of
the
world,
which
is
around
the
EQUATOR
热带（地区）
plant
species
found
in
the
tropics
见于热带地区的植物物种