我们喝完咖啡后，去了办理登机手续处。
After we had finished having coffee, we went to the check-in.
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解释
check-in 是由动词短语 check in（登记、办理手续）通过连字符连接形成的复合名词，指“办理登机手续的地方或过程”。
After we had finished having coffee, we went to the check-in.
check-in 是由动词短语 check in（登记、办理手续）通过连字符连接形成的复合名词，指“办理登机手续的地方或过程”。