在试图描述戏剧的起源时，人们必须主要依靠推测，因为几乎没有具体的证据可以引证。
In seeking to describe the origins of theater, one must rely primarily on speculation, since there is little concrete evidence on which to draw.
对于给予外企这些特殊待遇的经济解释，政策制定者们常常引证说明，FDI对国内企业的生产效率外溢，可以产生正的外部效应。
As economic rationale for this special treatment, policymakers often cite positive externalities generated by FDI through productivity spillovers to domestic firms.
对于给予外企这些特殊待遇的经济解释，政策制定者们常常引证说明，FDI对国内企业的生产效率外溢，可以产生正的外部效应。
As economic rationale for this special treatment, policymakers often cite positive externalities generated by FDI through productivity spillovers to domestic firms.
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