首要原因是私家车数量的大量增加。
The first cause is the great increase in the number of private cars.
私家车数量的增长是这一变化趋势的唯一原因。
The rise of car ownership is the single biggest reason for this trend.
随着私家车数量的不断增加，车库成为人们谈论得越来越多的话题。
With the increasing number of private cars, the garage became more and more people talk about the topic.
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