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Shifting around heavily unionized labor forces can be difficult , he adds .

他说，由于航空业的工会相当强大，调动员工都可能很困难。

It closed stores , renegotiated contracts with suppliers and extracted significant concessions from unionized workers .

公司关闭了一些门店，与供应商重议合约，并在与工会员工的协商中得到了相当程度的让步。

A unionized workforce is often a more productive one .

加入工会的职工往往生产效率更高。

Unions are weak in the private sector ; only about 7 percent of private workers are unionized .

私营部门中的工会力量薄弱；只有约7%的私营部门雇员加入工会。

And when it did so it was to protect unionized labor from competition , not to protect children from harsh working conditions .

但是政府这样做的真正原因却是为了保护工会组织的工人免受竞争的冲击，却没有保护童工远离艰苦的工作环境。