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rollerball

noun
/ˈrəʊləbɔːl/
/ˈrəʊlərbɔːl/
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  1. a type of ballpoint pen宝珠笔;签字笔
  2. (also trackball, tracker ball)
    (computing计算机) a device containing a ball that is used instead of a mouse to move the cursor around the screen宝珠笔;签字笔
rollerball
Pens and pencils and their parts:ballpoint, Biro, cartridge...

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