dual
adj
ˈdjuːəl
adj
1
having
two
of
something
or
two
parts
双的，双重的，两部分的
dual
role/purpose/function
The
bridge
has
a
dual
role,
carrying
both
road
and
rail.
这座桥有双重用途，既是公路又是铁路。
a
dual
system
of
education
双重教育体系
dual
citizenship/nationality
She
has
dual
nationality
,
of
Canada
and
Britain
(=she
is
a
citizen
of
Canada
and
Britain)
.
她有加拿大和英国双重国籍。