Good morning, everyone. Today we're going to discuss the history of the bicycle. The first two-wheeled vehicle was invented in 1817 by a German baron, Karl von Drais. It was called the 'running machine' because riders pushed themselves along with their feet. However, it wasn't until the 1860s that pedals were added, and the modern bicycle began to take shape. Interestingly, the introduction of the safety bicycle in the 1880s, with equal-sized wheels and a chain drive, made cycling much safer and more popular, especially among women. This design essentially remains the standard today.
❓ Theo bài giảng, sự thay đổi lớn nào đã xảy ra vào những năm 1880?
A. Phát minh ra chiếc máy chạy bộ đầu tiên
B. Việc thêm bàn đạp vào xe đạp
C. Sự phát triển của xe đạp an toàn với bánh xe có kích thước bằng nhau
D. Sự ra đời của bộ truyền động xích đầu tiên
✅ 正确答案
The development of the safety bicycle with equal-sized wheels