05 Aug 2010 day after day...
day after day
each day repeatedly (used especially when something is boring or annoying)
She hates doing the same work day after day.
http://www.google.com/dictionary?hl=zh-CN&sl=en&tl=zh-CN&q=day+after+day
day by day
all the time; a little at a time and gradually
Day by day his condition improved.
http://www.google.com/dictionary?hl=zh-CN&sl=en&tl=zh-CN&q=day+by+day
from day to day
http://www.google.com/dictionary?hl=zh-CN&sl=en&tl=zh-CN&q=from+day+to+day
from one day to the next
http://www.google.com/dictionary?hl=zh-CN&sl=en&tl=zh-CN&q=from+one+day+to+the+next
by day
They travelled by day and stayed at hotels by night.
http://www.google.com/dictionary?hl=zh-CN&sl=en&tl=zh-CN&q=by+day
by the day
He got paid by the day.
http://www.google.com/dictionary?hl=zh-CN&sl=en&tl=zh-CN&q=by+the+day
Til next time,
at 00:00