over and over again.
one by one.
副词，
不停地、不断地：continuously，uninterruptly，unbrokenly，nonstop
连续地：sequentially
形容词的话，把
-ly
去掉
on end；
in a row；
hour after hour；
in series；
continuously
continuously
ever-lasting
constantly
frequently
time and time again
over and over again
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