also track ball, tracker ball
(~s)
A ~ is a ball on some computers that you turn in order to move the cursor.
N-COUNT
also track ball, tracker ball
(~s)
A ~ is a ball on some computers that you turn in order to move the cursor.
N-COUNT
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012