@blufreezy @vonKriegstein @BommerBommer The right question is what outcomes would be over the same time period in the same place without the passports. Obviously this can't be known with certainty, all you can do is reason about it.
@blufreezy@vonKriegstein@BommerBommer正确的问题是，如果没有护照，在同一时间段内，在同一个地方会有什么结果。显然，这不能确定无疑，你所能做的就是对它进行推理。