Aphidoidea
蚜总科
🗣️ 情景例句
Would it be all right if I went with you?
我跟你去可以吗？
We must get back to first principles.
我们必须回到基本原则上来。
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。