This command will invoke the HELP system.

这条指令将启用“帮助”系统。

《牛津词典》

Messaging: two systems connect to a common messaging system and exchange data and invoke behavior using messages.

消息：两个系统连接到一个公用的消息系统，互相交换数据，并利用消息调用行为。

youdao

In this case, claims processing consumer invokes composite claims processing service, which applies the set of rules to decide which claim processing system to invoke.

在这种情况下，索赔处理使用者将调用组合索赔处理服务，该组合服务将应用一组规则来确定调用哪个索赔处理系统。

youdao

If you have an iPhone, iPod Touch , or iPad , Apple provides tools to disable in-app purchases, to stop apps from being downloaded, and you can invoke a rating system filter, and much more.

FORBES: Your Privacy has Gone to the [Angry] Birds