Lack of vitamin D is another factor to consider.
缺乏维生素D是另一个需要考虑的因素。
Vandalism is sadly another factor.
可悲的是,蓄意破坏是另一个因素。
Another factor may be that more people are trying to overpack their carry-on bags to avoid checked-baggage fees, though the airlines strongly dispute this.
另一个因素可能是,即使航空公司强烈反对,还是有越来越多的人为了避免托运行李费用而试图携带过量的随身行李。
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