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لیبرال دموکراسی: جنگ با جمهوری اسلامی؛ رقابت با چین یا مهار یک تهدید منطقهای؟
bzahedi | ۱۰ دقیقه قبل
۰ ۳
دسته: تعیین نشده
Ebi jan ... very nice language tree ... here is another reference:
Babies summon their energy to push out that easiet consonant sound "mmmm" and then relax into an open mouth vowel, usually "ah" — which is the easiest. When you combine that with a baby's natural repetition in speech, or "babbling," you get " ma-ma".
https://theweek.com/articles/464678/why-babies-every-country-earth-say-mama#:~:text=Babies%20summon%20their%20energy%20to,pa%2C%22%20and%20so%20on.