ماشین Fundamentals Explained
Flying model craft and stories of manned flight go back a lot of generations; however, the initial manned ascent — and Safe and sound descent — in modern instances came about by larger sized hot-air balloons created inside the 18th century.گوتارد اکسپرس، سوئیس، ۱۸۹۷ آغاز به کار قطارها به سدهٔ ۱۵۰