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dummy runs is dummy run's Plural Form
dummy run
US
UK
na.
演习；排练
Plural Form：
dummy runs
E-C
E-E
na.
1.
演习;排练
n.
1.
a
test
of
something
in
which
you
practice
using
or
doing
it
before
using
or
doing
it
in
a
real
situation
