这一变化的起因是，现在全国有几十家公司购买废弃的塑料汽水瓶，并把它们制成栅栏桩、油漆刷等。
The reason for the change is that now there are dozens of companies across the country buying discarded plastic soda bottles and turning them into fence posts, paintbrushes, etc.
数十家公司已经开始了试点项目和小规模生产。
Dozens of companies have begun pilot projects and small-scale production.
我去了几十家公司求职，但一份工作都没找到。
I went to dozens of businesses in search of work but wasn't able to get any.
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