vaccine
noun
ˈvæksiːn
noun
1
a
substance
which
contains
a
weak
form
of
the
BACTERIA
or
VIRUS
that
causes
a
disease
and
is
used
to
protect
people
from
that
disease
疫苗
a
polio
vaccine
小儿麻痹症疫苗
Doctors
worried
that
there
would
not
be
enough
vaccine
for
everyone
who
needed
it.
医生担心没有足够的疫苗给每个需要的人。