backup
noun
ˈbækʌp
noun
1
something
that
you
can
use
to
replace
something
that
does
not
work
or
is
lost
备用品，后备
C
Always
have
a
backup
plan.
什么时候都要有一个备用计划。
a
backup
generator
备用发电机
2
a
copy
of
a
computer
document,
program
etc,
which
is
made
in
case
the
original
becomes
lost
or
damaged
〔计算机文件、程序等的〕备份
C
Make
a
backup
of
any
work
you
do
on
the
computer.
你计算机上做的任何工作都要备份。
3
people
or
things
that
can
be
used
to
provide
support
and
help
if
they
are
needed
后备人员; 备用物品
U
Army
units
can
only
operate
if
they
have
sufficient
backup.
部队有足够的后备力量时才能作战。
a
backup
team
后备小组
4
someone
who
will
play
in
a
sports
team
if
one
of
the
other
players
is
injured
or
ill
[美] 〔球队的〕替补队员;
C | AmE
a
backup
goalie
替补守门员