Telephony, once the mainstay of the industry, is just one service that can be offered over broadband connections, which will increasingly depend on new fibre-optic and wireless technology, not copper.

电话服务已经从当年的产业支柱变为众多服务项目之一。这项服务如今已经可以通过宽带来提供，而宽带服务已经越来越多的依赖于光纤和无线技术，而非铜线。

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The automotive industry is the mainstay of the country's economy.

汽车工业是这个国家的经济支柱。

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Fruits were selected for the long term mainstay industry of demonstration area, and it will play an important role in agricultural production and everyday life of immigrants.

果树业作为肯福环境移民示范区的一项长期的支柱产业，在示范区移民的生产、生活中起着不可缺少的作用。

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Indeed, Mr Deighton believes that the television commercial will remain the mainstay of the advertising industry for years to come.

ECONOMIST: The recession in advertising

That is because natural-gas exports, long the mainstay of the energy industry, are threatened by shale gas in the United States (they have fallen by 5% over the past year).

ECONOMIST: Energy in Canada

Despite the years of decline, the cocoa industry is still the mainstay of Ghana's economy.

CNN: Ghana cocoa industry at crossroads