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导针送纸
🗣️ 情景例句
Now he's got his own trading company. Ann told me he made four million dollars last year.
现在他已有自己的贸易公司。安告诉我他去年赚了400万美元。
Happens all the time.
常有的事。
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）。