rolling
adj
ˈrəʊlɪŋ
adj
1
rolling
hills
have
many
long
gentle
slopes
〔山〕绵延起伏的
2
done
or
happening
regularly
over
a
period
of
time,
not
all
at
once
定期的; 周而复始的
We
recommend
a
rolling
programme
of
machine
upgrading.
我们推荐一个定期的机器升级方案。