Hadder
have的过去式和过去分词
🗣️ 情景例句
Five hundred dollars, please. And could you give me ten dollar in small change?
请换500美元。再另外能否给我10元的小面额零钱？
It is a small flock that has not a black sheep.
家家难免有败类。
and a period (which is the time it takes a wave crest to travel one wave length).
和周期（浪峰走过一个波长所需的时间）。