??? 情景例句
I've got three days off next week.
下星期我有三天假。
May I pay by credit card?
我可以用信用卡付款嗎？
The second marks the arrival of transverse vibrations which travel more slowly and arrive several minutes after the first.
然后記錄下的是橫向波的到達(dá)，橫向波比縱向波傳播得慢，在縱向波到達(dá)幾分鐘后才能到達(dá)。