End-to-end encryption and privacy controls.
Message and call for free* around the world.
Group conversations made simple.
Say it with stickers, voice, GIFs and more.
Reach your customers from anywhere.
http://studentedu.farafile.ir/file/27290/تحقیق-درمورد-ساختمان-و-طرز-کار-موتورهای-احتراقی