The reasons for that are unclear, especially since the birds make several stops during their return flights to Sweden in the spring.
它们这样做的原因尚不明确，特别是它们在春天返回瑞典的途中会休息好几次，更是让大家摸不着头脑。
Xiamen Airlines does not require reconfirmation of existing reservations for onward or return flights of Xiamen Airlines.
对于已定妥厦航续程或回程航班座位，厦航不再要求进行再确认。
Xiamen Airlines does not require reconfirmation of existing reservations for onward or return flights of Xiamen Airlines.
对于已定妥厦航续程或回程航班座位，厦航不再要求进行再确认。
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