Trackballs
(trackball 的复数) n. 追踪球；轨迹球
🗣️ 情景例句
It will take a few years for the region to recover economically.
这个地区的经济恢复得花几年的时间。
Don't forget to put stamps on the letter.
不要忘记在信封上贴邮票。
Oh, I don't know. You decide!
哦，我不知道，你来决定。