Normally, this type of extension is required to perform additional tasks for the base command.

通常，要求这种类型的扩展执行基本命令的其他任务。

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Further specializations of histone variants have evolved in some lineages to perform additional tasks.

更加专门化的组蛋白变体在一些谱系中进化到执行额外的功能。

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Classes that inherit from this class can override this method to perform additional tasks when the event occurs.

从此类继承的类可以重写此方法，以便在发生该事件时执行其他任务。

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While the Air Force has stated that the vehicle is meant only for conducting orbital science experiments, analysts say the X-37B is capable of much more, and could perform additional tasks such as acting as an orbital spy, sneaking up on and tampering with enemy satellites or hauling small batches of supplies to the International Space Station.

ENGADGET: Air Force X-37B space plane books additional time on orbital cruise, orders another margarita