trackballs的翻译，读音
释义：
(trackball 的复数) n. 追踪球；轨迹球
plural of trackball
n. an electronic device consisting of a rotatable ball in a housing; used to position the cursor and move images on a computer screen
plural of trackball
n. an electronic device consisting of a rotatable ball in a housing; used to position the cursor and move images on a computer screen