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service exist
service exist
service exist
例句:
1
To
increase
the
flexibility
of
the
overall
system
,
two
implementations
of the
service
exist
,
with
one
serving
as
the
backup
.
要
提高
整个
系统
的
灵活性
,
服务
的
两个
实现
必须
存在
,
并且
其中一个
用作
备份
。
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's
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then
not
what
say
by
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of
as