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信息发布者：
has
become
impossible
as
often
as
before
Anyway
see
the 
amazing 
changes
yet
recently
recent
past
repair over ten bicycles
learn more about Beijing's past and present 
about the changes in Beijing
over the past century
Have
you
seen
recently
haven't
the
changes
over
the
past
century
environment
transport
condition
return
last
abroad
primary
communicate
communication
exactly
exact
living conditions
return from the USA
go abroad
keep in touch with eachother
mainly communicate by email
make communication much easier
be/get used to
at primary school
on one's own
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