Knapsacked
n. (军用、旅行用的帆布或皮制)背包
🗣️ 情景例句
You're still thinking about something to do, aren't you?
你还在想要找点事做， 是吗？
Don't you have my hat?
你没拿我的帽子吧？
The second marks the arrival of transverse vibrations which travel more slowly and arrive several minutes after the first.
然后记录下的是横向波的到达，横向波比纵向波传播得慢，在纵向波到达几分钟后才能到达。