Nigrometer
黑度计
🗣️ 情景例句
It's good to meet you.
很高兴见到 。
It is an ill bird that fouls its own nest.
家丑不可外扬。
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。