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1·Sincerity condition: Speaker regrets act a.

真诚条件道歉者对行为A觉得遗憾。

2·It's very necessary to advocate tax paying with sincerity according to the analysis of the current circumstances of tax condition in our country.

根据我国目前的税收社会环境状况分析，提倡诚信纳税十分必要。