Tomback
n. 一种铜与锌的合金
🗣️ 情景例句
I'd like to buy some stamps for this letter.
我想买这封信的邮票。
Many wells, many buckets.
井多吊桶也多。
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。