There are two main types of viruses: shell, intrusive.

主要有两种病毒：shell病毒和instrusive病毒。

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Two main types of analysis functions are provided by this tool.

这一工具提供的两种主要分析功能是。

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There are two main types of profit: Gross profit and net profit.

赢利又分主要两种：总利润和纯利润。

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Okay. Well, there are two different main types of horse-riding.

好吧。赛马主要有两种。

知道马球吗？ - SpeakingMax英语口语达人

There are two main types of US Savings Bonds: Series I and Series EE.

FORBES: How to Find Low Risk, High Return Investments

Instead, it attracts two main types of shoppers: the young and the economically desperate.

FORBES: Who Really Shops on Black Friday?

These cut-rate homes offer value for two main types of real estate investors: owner-occupants and distressed-property specialists.

FORBES: Finding Value in the Economic Downturn