Eiseman
[人名] 艾斯曼
🗣️ 情景例句
How have you been?
你近来怎么样？
What shall I send him for his Christmas?
我要送他什么东西作为圣诞礼物？
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）。