However, the penny farthing's popularity lasted only about 20 years, until the advent of the safety bicycle.
不过，随着安全自行车的出现，这种车子只流行了大约20年。
Mariah Nunes, a sophomore who is a team manager, said she researched an essay on bicycle safety.
校队经理同时也是大二的玛丽亚·纽恩斯说她在研究一篇有关自行车安全的论文。
In some parts of the world, cyclists have been powering safety lights for years with devices called bicycle dynamos, which use a generator to create alternating current with every turn of the wheels.
在世界的一些地方，骑自行车的人已经通过叫自行车发电机的装置产生了多年的安全电能。当自行车车轮转动的时候一个装在上面的发电机就会产生交流电。
Proper maintenance of the bicycle and safety rests solely on the participant.
参赛选手全权对车辆的正确保养和安全负责。
Additionally, the bicycle features a static inner wheel system with safety features such as integrated reflectors on the rotating outer wheels and a taillight, which is mounted in the bike's frame.
此外，自行车功能静态内轮系统的安全功能，如集成的反光板的旋转外车轮和尾灯，这是安装在自行车的框架。
Ride your bicycle instead of driving your car, depending upon your destination, the weather, and safety concerns.
从你的目的地、天气和安全方面考量，用骑车代替开车。
"We care rider's safety" is the key value in every Sate-Lite bicycle reflector.
“关注骑行者的安全”是我们贯注于自行车反光片产品的理念。
The differences between the way of car traveling and that of bicycle traveling lie in the many aspects, such as speed, efficiency, safety…
小汽车旅行方式和自行车旅行的方式的不同存在于很多方面，比如速度，效率，安全…
Every day, children die for want of simple technology such as smoke detectors, bicycle helmets, and car safety seats.
每天都有儿童因为缺乏简单的科技而死亡，例如烟雾侦测器、脚踏车头盔、及汽车安全座位。
An important index for safety running of electric bicycle is brake performance. The traditional testing technique costs time and vigor. Manpower and environment factors both affect it enormously.
制动性能是关系到电动自行车行驶安全的一项重要指标，传统的路检方法费时费力，受人为和环境因素的影响大。
The key research object of safety and efficiency of the mixed traffic flow should be the interaction influence between the bicycle flow and motor vehicles'.
城市灯控平面交叉口混合交通流安全和效率的核心研究对象应该是自行车与机动车交通流间的相互影响。
The key research object of safety and efficiency of the mixed traffic flow should be the interaction influence between the bicycle flow and motor vehicles'.
城市灯控平面交叉口混合交通流安全和效率的核心研究对象应该是自行车与机动车交通流间的相互影响。
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