The application has three main functions.

这个程序有三大主要功能。

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The datajs API currently contains two main functions.

datajs的API当前包括两项主要功能。

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The main functions in the SuperObject class relate to handling of persisted array variables.

superobject类中的主要功能，与处理永久性数组变量相关。

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But Cmdr Hadfield insisted his social media activities were secondary to his main functions at the space station.

BBC: Chris Hadfield: 'Space was too good not to share it'

Their main functions were finance (93) and corporate management (81).

FORBES: Management and Business Operations

Life insurance has two main functions.

FORBES: 5 Common Myths About Life Insurance Needs