البحث
إكتشاف أشخاص جدد وإنشاء اتصالات جديدة وصداقات جديدة
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an optical device for focussing a camera or other instrument automatically
an optical device for focussing a camera or other instrument automatically
an optical device for focussing a camera or other instrument automatically
an optical device for focussing a camera or other instrument automatically
the energy that an atomic system must acquire before a process (such as an emission or reaction) can occur