I think the "plain" is the difficult part. Tian's sounds like

来源: 小谋 于 2009-04-05 18:59:32 [] [博客] [旧帖] [给我悄悄话] 阅读数 : (63 bytes)
回答: re-read 读新概念:Waves (l40 nce4) 由 天泽园 于 2009-04-05 12:45:41

"plan" but not "plain".

I think her "flat" is ok.

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