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1. Oxford Dictionary

   trackball

   • IPA[ˈtrakbɔːl]

   英式

   • n.
     a small ball that is set in a holder and can be rotated by hand to move a cursor on a computer screen.

   • noun: trackball, plural noun: trackballs

2. • 更多解釋

   trackball

   • IPA[ˈtrakˌbôl]

   美式

   • n.
     a small ball that is set in a holder and can be rotated by hand to move a cursor on a computer ...

   Oxford American Dictionary