历史上，这家国家铁路公司垄断了所有的客运铁路服务。

Historically, the national railroad company held a ___monopoly on all passenger rail services.

缺乏竞争是由于这家科技巨头在智能手机市场的垄断地位。

The lack of competition was due to the tech giant's ___monopoly in the smartphone market.

拆分企业垄断对于促进创新和公平定价可能至关重要。

Breaking up a corporate ___monopoly can be essential for fostering innovation and fair pricing.