Trackballs
(trackball 的复数) n. 追踪球；轨迹球
🗣️ 情景例句
Keep the change for yourself.
找回的钱你留着。
Look who's talking!
怎么不说你自己？
If it is a long report, it is easy to make changes to the text.
即使是一篇很长的报告，也很容易将原文改动。