sometime有时
for some time 有段时间
from time to time有时
each time 每次
偶尔
between timesevery
now and then
once in a way
once in a while
经常
at every turn
evermore
half the time
often
regularity
一直
all along
all the while
all throughat
all times
straight
英语中表频率的短语有哪些?类似 now and then