The Ballpoint Pen（圆珠笔）_100字

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The ballpoint pen is one of the most useful inventions. 

It was invented by Ladislas Bior in Hungary in 1935.It is widely used in people's daily life. It doesn't need refilling after the thing in it runs out. It hardly leaksand can help us write faster. So it's much more popular than the pen. 

Its price is usually low and it has become smaller and lighter than before.

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