Good morning, everyone. Today we're going to look at the history of the bicycle. Now, you might think the bicycle is a fairly modern invention, but in fact, the first two-wheeled vehicle was created in 1817 by a German baron. However, it had no pedals. You had to push it along with your feet. It wasn't until 1860s that pedals were added to the front wheel. Around 1885, the 'safety bicycle' was developed, which had a chain drive to the rear wheel, making it much safer and more efficient. This design quickly became popular and is the basis for most modern bicycles.
❓ Cải tiến chính của 'xe đạp an toàn' được giới thiệu vào khoảng năm 1885 là gì?
A. A. Nó không có bàn đạp.
B. B. Nó sử dụng bộ truyền động xích đến bánh sau.