In today's lecture, we'll discuss the history of the bicycle. The first two-wheeled vehicle, called the draisine, was invented in Germany in 1817. It had no pedals; riders pushed their feet against the ground to move. Later, in the 1860s, French inventors added pedals to the front wheel, creating the velocipede. However, this design was uncomfortable due to its rigid frame and wooden wheels. It wasn't until the 1880s that the modern safety bicycle, with a chain drive and equal-sized wheels, became popular, making cycling safer and more accessible for everyone.
❓ Theo bài giảng, vấn đề chính của xe đạp velocipede là gì?
A. Nó quá nặng để có thể đạp lên dốc.
B. Nó không có phanh.
C. Khung xe cứng nhắc và bánh xe bằng gỗ, gây ra sự khó chịu.
D. Nó quá đắt đối với hầu hết mọi người.
✅ 正确答案
Its frame was rigid and wheels were wooden, causing discomfort.