صداي آرام تر، خانواده بزرگتر Men with deep voices tend to have more children than men with high voices, American scientists have found. They spent six months studying a tribe in Africa. Males with a deep voice had an average of two more children than those men in the tribe with higher voices. Deep (adjective) :bottomless عمیق Tend (verb): be likely متمایل بودن به Tribe (noun): family قبیله، طایفه Average ) adjective) : common, intermediate
