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内容
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Today
,
we
’
re
talking
about
vaccines
and
why
they
’
re
so
important
.
今天，我们要讨论的话题是疫苗，以及注射疫苗的重要性。
Our
bodies
have
an
immune
system
that
protects
us
from
infections
and
diseases
.
身体免疫系统可防止感染和疾病。
Basically
,
a
vaccine
helps
get
our
immune
system
ready
to
fight
off
a
certain
illness
.
基本上，疫苗可帮助免疫系统对抗特定疾病。
A
vaccine
is
usually
made
of
the
germ
that
could
make
you
sick
,
but
the
germ
is
weakened
or
killed
.
通常，疫苗含有许多致病细菌，但这些细菌已无法致病或已经死亡。
When
a
vaccine
enters
our
body
,
the
immune
system
thinks
it
’
s
the
real
germ
and
responds
to
it
the
same
way
it
does
to
germs
,
it
fights
it
.
当疫苗进入体内，免疫系统认为它是细菌，并将以对抗细菌的方式对抗疫苗。
But
,
the
vaccine
is
easier
to
fight
than
the
illness
you
’
re
being
vaccinated
against
,
and
it
won
’
t
make
you
sick
.
然而，这种疫苗比对抗疾病来说更加容易，且不会致病。
Once
the
immune
system
figures
out
how
to
fight
a
germ
and
win
,
it
remembers
what
works
.
一旦免疫系统战胜该疫苗，它将会依循原有记忆进行保护。
Should
such
an
enemy
enter
your
body
again
,
your
immune
system
is
ready
to
fight
it
off
and
will
move
to
attack
before
it
has
a
chance
to
make
you
sick
.
一旦敌人再次侵入身体，免疫系统将在致病之前消灭敌人。
Sometimes
our
immune
systems
need
a
refresher
course
,
which
is
why
we
get
booster
doses
of
some
vaccines
.
免疫系统有时也需要提神，这就是为什么我们要注射加强针的原因。
Some
germs
are
tricky
and
change
over
time
,
like
flu
viruses
.
像流感等病毒随时都在发生变化。
We
need
to
get
the
flu
vaccine
every
year
so
our
bodies
can
be
ready
to
take
on
the
latest
flu
viruses
!
我们每年都需注射流感疫苗，保证免疫系统可对抗最新流感病毒。
