in the late 18th century, the first time the bike is appears. It is associated with the daily life of the people. It helps them in all aspects such as transport, trade, shipping, ... So, the bike was viewed as a close friend of humans around the world.Until now, the bike is still in widespread use. Can parents peace of mind when your child can ride a bike to school because of the convenience and ease of use of it. Besides, people use bicycles for outside activities such as walking, go play, ... Because with the following car-shopping cart and saddle should you be able to carry a person or bring some items put in the cart car. With a compact design, the bike can easily take many small sugar though terrain or steep. Because of this, people like to use a bicycle to cargo than trucks. In addition, a bicycle motion by people so it does not pollute the environment. Cyclists just use a very small force, but they can go a long. Cycling is also a way of useful physical activity such as sports, fitness activities. So we can say, the bike was widely used and suitable for all ages
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