how about the following explanation on the usage of 'since' and

来源: yingyudidida 于 2015-07-30 19:48:51 [] [博客] [旧帖] [给我悄悄话] 阅读数 : (374 bytes)
回答: 苦行僧不如众乐乐。。：） 由 beautifulwind 于 2015-07-30 14:05:28

Chinese stock market continued to fall on Tuesday since three weeks before ... =
Chinese stock market continued to fall on Tuesday since the starting of the fall three weeks before the fall on Tuesday ...

Googled and found the following interesting on 'before', 'ago' and 'earlier':
http://www.italki.com/question/111799

所有跟帖： 

• 我记得，since当“自从”时， -beautifulwind- ♀ 给 beautifulwind 发送悄悄话 beautifulwind 的博客首页 (223 bytes) () 07/30/2015 postreply 20:15:28

• 阅读大家不同的翻译版本收获不小，尤其是几位写作大拿的，用词和句法让人眼前一亮。 -yingyudidida- ♂ 给 yingyudidida 发送悄悄话 yingyudidida 的博客首页 (24 bytes) () 07/30/2015 postreply 20:16:49

• 嘿嘿，必须谢谢你的发明：） -beautifulwind- ♀ 给 beautifulwind 发送悄悄话 beautifulwind 的博客首页 (0 bytes) () 07/30/2015 postreply 20:57:52

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