Trackballs
(trackball 的复数) n. 追踪球；轨迹球
🗣️ 情景例句
How long does it take?
要花多久时间？
That won't happen, will it?
不会吧？
It's a small blue case and it's got a zip.
是只蓝色的小箱子，上面有拉链。