Good morning, everyone. Today, we're going to discuss the history of the bicycle. Now, many people assume the bicycle was invented in the 19th century, and that's partly true. However, the first two-wheeled, human-powered vehicle, called a 'draisine', appeared in 1817, invented by a German baron. It had no pedals; riders pushed their feet against the ground. Later, in the 1860s, French inventors added pedals to the front wheel, creating the 'velocipede'. But it wasn't until the 1880s that the chain drive and pneumatic tires made bicycles safer and more comfortable, leading to their widespread popularity. So, the key point is that the modern bicycle evolved gradually over several decades.
❓ 강의에 따르면, 1880년대 자전거 설계의 주요 개선점은 무엇이었나요?
A. A. 앞바퀴에 페달을 추가하는 것
B. B. 드라이지네의 발명
C. C. 체인 드라이브와 공기 타이어의 도입
D. D. 알루미늄과 같은 더 가벼운 재료의 사용
✅ 正确答案
C. The introduction of the chain drive and pneumatic tires