Mary gregory
玛丽格雷戈里彩色玻璃器皿(通常绘有儿童画像,流行于19世纪)
🗣️ 情景例句
Are we picking him up at the station?
我们要去车站接他吗?
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。
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