美国的移动电话运营商们正在推出追踪服务。
Mobile operators in America are now launching tracking services.
美国的移动电话运营商们也正在推出追踪服务。
Mobile operators in America are now launching tracking services too.
因此,追踪服务机制必须进行,以发现和确认需要补救措施。
Therefore, a mechanism for follow-up must be in place to uncover and identify patterns that may require remedial action.
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