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track ball 【計算機】跟蹤球〔可用以操縱電腦顯示屏上光標移動的位置,...

track clearer

Input devices include keyboards and pointing devices such as mouse , joystick , track ball , or light pen 輸入設備包括鍵盤和點擊設備如鼠標,操縱桿,跟蹤球或光筆。