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Can I carry this bag on?/Can I take this on board? /Can I hand-carry this? 我可以带这个登机吗？Ground staff: Yes, that would be fine. 可以，没问题。/ No. You need to__ check it in__. 不行，你必须托运。carry-on 随身行李on board 登机check （在机场指托运）托运+in, 酒店指寄存行李对话：**L: How many bags would you like to check in? 你有几个包包要托运呢？D: Um, I've got one bag, but can I carry this on board? 我有一个包包，但是我可以带这个登机吗？L: Yeah, that would be fine! 可以，没问题！
