最近在日本生产出了一种既无内胎、又无外胎的自行车。它的辐条比普通自行车的辐条粗得多,所以就结实得多。这种车在每根辐条的顶端安上了一个橡皮缓冲器作为镶头。设计者认为,无胎自行车可避免一般自 Recently, a bicycle without inner tube and no outer tire was produced in Japan. Its spokes are much rougher than the spokes of regular bicycles, so much stronger. The car fitted a rubber buffer on the top of each spoke as a head. The designer believes that a non-tire bicycle can be avoided from the general