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。
The reasons for that are unclear, especially since the birds make several stops during their return flights to Sweden in the spring.
瑞典警方星期六疏散了一架载有273名乘客及机组人员的飞机，并逮捕了其中一名乘客。之前这架航班在从加拿大飞往巴基斯坦的途中由于受到爆炸物威胁转而飞往斯德哥尔摩。
Swedish police evacuated a plane carrying 273 people and detained one passenger Saturday, after a flight from Canada to Pakistan was diverted to Stockholm because of a bomb threat.
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