Wheel (3500-3350 BC)

The invention of the wheel has been pivotal for technology in general, setting the foundation for future developments such as the water wheel, the cogwheel, and the spinning wheel. Modern descendants include the propeller, the jet engine, and the turbine. Pictured is the Wheel of the Etruscan chariot (ca. 530 BC)

車輪（公元前3500年到3350年）

車輪的發(fā)明對(duì)于技術(shù)的總體發(fā)展至關(guān)重要，為未來的進(jìn)一步發(fā)展，如水車、齒輪、紡車的發(fā)明奠定了基礎(chǔ)。車輪在現(xiàn)代的衍生物包括螺旋槳、噴氣式發(fā)動(dòng)機(jī)和渦輪機(jī)。圖中是伊特魯里亞雙輪戰(zhàn)車的車輪（約在公元前530年）。