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Date: 29-12-2016
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Date: 15-12-2016
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Date: 15-12-2016
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Speed
Speed is an expression of the rate at which an object moves relative to some defined reference point of view. The reference frame is considered stationary, even though this is a relative term. A person standing still on the surface of the Earth considers himself or herself to be stationary, but this is not true with respect to the distant stars, the Sun, the Moon, or most other celestial objects.
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علامات بسيطة في جسدك قد تنذر بمرض "قاتل"
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أول صور ثلاثية الأبعاد للغدة الزعترية البشرية
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مدرسة دار العلم.. صرح علميّ متميز في كربلاء لنشر علوم أهل البيت (عليهم السلام)
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