Phenanthridone
[化] 菲啶酮
🗣️ 情景例句
We have a very important meeting on at the moment.
现在我们正在开一个非常重要的会。
How far is it to the university?
它离大学多远？
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。