precautionary
adj
prɪˈkɔːʃənəri
adj
1
done
in
order
to
prevent
something
dangerous
or
unpleasant
from
happening
预防的
More
troops
were
sent
to
the
area
as
a
precautionary
measure
.
为谨慎起见，更多的军队被派往该地区。