当你骑着自行车在山坡地带行驶时,为了爬坡就得特别使劲地踩动踏板,数百公尺长的上坡路往往累得你满头大汗。而在转入下坡时,面临着越来越快的车速,你又得用力按住刹车并全神贯注地把握好方向,以防不幸事故的发生。尽管如此,每年发生在坡路上的事故仍然不少。因此,多年来就有不少人致力于研究制造一种新颖的自行车,以期在坡地行驶时既省力又安全。联邦德国一位青年教师制作 When you’re riding a bike on a hillside, you have to pedal the pedals particularly hard for climbing, and hundreds of meters of uphill climbs tend to make you sweaty. When turning downhill, facing faster and faster speed, you have to hold down the brake force and concentrate on a good grasp of the direction, to prevent the unfortunate accident. In spite of this, there are still many accidents on the slopes each year. Therefore, many people have devoted themselves to researching and manufacturing a novel bicycle for many years, so as to save energy and safety when driving on a slope. Produced by a young German teacher