父母来加探亲是否一定要买往返机票?

一般买往返票比较便宜,如果考虑时间的灵活性,可以把回程机票买成Open的,就是不限制具体日期.
 
The drawback for round trip ticket is that: they must leave within a year. If you want them to stay longer, you'd better buy a one-way ticket.
 
No problem if they come through Shanghai or Beijing. But could be a big problem if they come through Hong Kong.
 
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