Optional delivery
[经] 选择港交货
🧩 词语组成解析
🗣️ 情景例句
I have to go out and hand out fliers.
我要出去派传单。
We have adopted much more flexible methods in our dealings.
我们在具体操作方法上灵活多了。
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。