as plain as day

Phrase - informal :
خیلی واضح است که . . . . .
خیلی روشن است که . . . .
مثل روز روشن است که . . .
به عنوان مثال:
It has been as plain as day for three decades that the day would come when oil supply could no longer increase at the same rate as demand, and all the evidence is that that is starting to happen this year
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