In today's lecture, we'll discuss the history of the bicycle. The first two-wheeled vehicle, called the draisine, was invented in 1817 by Karl von Drais. It had no pedals; riders pushed their feet against the ground. In the 1860s, pedals were added to the front wheel, creating the velocipede, but it was nicknamed the boneshaker due to its uncomfortable ride. Later, in 1885, John Kemp Starley introduced the Rover Safety Bicycle, which featured a chain drive to the rear wheel and equal-sized wheels, making it much safer and more efficient. This design became the template for modern bicycles.
❓ 로버 세이프티 자전거가 이전 모델들에 비해 가졌던 주요 장점은 무엇이었나요?
A. A. 더 큰 앞바퀴를 갖추어 속도를 높였다.
B. B. 체인을 사용하여 뒷바퀴를 구동함으로써 안전성과 효율성을 향상시켰다.
C. C. 더 가볍고 휴대하기 쉬웠다.
D. D. 보조용 모터가 포함되어 있었다.
✅ 正确答案
B. It used a chain to drive the rear wheel, improving safety and efficiency.