Teetering
v. 摇晃地站立或移动( teeter的现在分词 ); <美>玩跷跷板; 处在（灾难或危险的）边缘; 濒临
🗣️ 情景例句
Over?
结束？
Would you speak a little louder?
请稍微说大声点。
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。