A second source of monopoly is a large economy of scale.

垄断的第二个来源来自于规模效应。

youdao

A second source of growth was large-scale internal migration, mainly from south to north.

第二个增长动力来自大规模的国内迁移，主要是从南向北。

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A second source of carbon monoxide is Alberta, Canada, where large wildfires are burning.

另一个一氧化碳污染源在加拿大阿尔伯塔省，那儿正燃烧着熊熊大火。

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Intelligence sought to find a second source but was unable to do so, the FT added.

CNN: Report: UK's WMD source top Iraqi

Now that first source of systemic weakness plays into a second source - that the way banks of all developed economies finance themselves has become hideously dysfunctional.

BBC: Business

Where Members of Parliament have a second source of income from second jobs, irrespective of whether it is in their capacity as an MP, every payment shall be declared with a full description of who paid and what for.

BBC: In full: MP expenses reform plans