自行车简史
oller rinks, could be found in large cities.
The High Wheel Bicycle
In 1870 the first all-metal machine appeared. (Previous to this metallurgy9) was not advanced enough to provide metal strong enough to make small, light parts out of.) The pedals were still attached directly to the front wheel with no freewheeling10) mechanism. Solid rubber tires and the long spokes11) of the large fro
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