But we also need to stop thinking that a middle class can be sustained only by factory jobs.

但是，美国也需要停下来思考，中产阶级为何只能通过工厂工作来维持。

youdao

Only under special circumstances when the factory pollutes, do we need to regulate it.

只要工厂污染环境，我们就要严加管制。

youdao

Only under special circumstances when the factory pollutes, do we need to regulate it.

只要工厂污染环境，我们就要严加管制。

youdao