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I'll tell the professor, you don't feel lower back pain when you are talking standing.
原帖由 雲吞 于 2009-1-31 09:45 发表 9 W. I, s& U2 P0 q+ A- ~/ B- N8 q E. ~2 C0 I' ~/ O' `0 K6 _. ^, M1 N( f- l: j
I'll tell the professor, you don't feel lower back pain when you are talking standing.