Good morning, everyone. Today we're going to discuss the history of the bicycle. Now, many people believe the bicycle was invented in the 19th century, but in fact, the first two-wheeled vehicle, called a draisine, appeared in 1817 in Germany. It had no pedals; riders pushed their feet against the ground. Later, in the 1860s, pedals were added to the front wheel in France. However, it wasn't until the 1880s that the chain drive and pneumatic tires were introduced, making bicycles much more comfortable and efficient. This design quickly became popular worldwide.
❓ 강의에 따르면, 무엇이 자전거를 훨씬 더 편안하고 효율적으로 만들었나요?
A. 앞바퀴에 페달을 추가하는 것
B. 독일에서 드라이지네의 발명
C. 체인 드라이브와 공기 타이어의 도입
D. 프레임에 더 가벼운 재료를 사용하는 것
✅ 正确答案
The introduction of the chain drive and pneumatic tires