I'll suggest the Egyptian or the Levantine Arabic, they're widely known in the Arab world.
2015年3月27日
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I'll suggest Standard Arabic
From which you can understand all the dialects
2015年3月28日
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I think Modern Standard Arabic is the best way to learn any dialect. if you learned MSA First, you will be able to learnt any dialect. Then I think Egyptian And Levantine dialects are the easiest.