To sum up , there are three main ways of tackling the problem...

概括起来说，这一问题主要有三种解决办法…

《牛津词典》

There are two main ways.

有两个主要方法。

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There are three main ways that animals survive the cold in winter: sleep, adapt or migrate.

动物在寒冷的冬天有三种主要的生存方式：休眠、适应或迁徙。

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If there's a group, responsibility to help decreases and this is captured in different ways but the main idea is we all think someone else will help so we don't. There's a diffusion.

如果是一群人，帮助的责任就会分散变小,这体现在多个方面,但最主要的想法就是我们都认为别人会帮助,所以我们就不帮助了，责任被分散了。

耶鲁公开课 - 心理学导论课程节选

One of the main ways the Project confronts these trends is to hold periodic conferences and seminars.

CENTERFORSECURITYPOLICY: Balancing National Defense Interests and Press Freedom

But they have become one of the main ways of raising concerns about risky medical drugs and devices.

FORBES: Magazine Article

There are three main ways that a state can close a deficit: raid reserves, raise taxes or cut spending.

ECONOMIST: State budgets in crisis