Web [1] is exemplified by e-commerce shopping carts, enabling two way interaction between business and consumers.

Web[1]允许商家和用户之间的双向互动，电子商务购物车是它的典型特征。

youdao

They also get a double benefit, because their interaction is two-way.

他们也得到双倍的收益，因为他们的交流是双向的。

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A partner may provide services to the process, require services from the process, or participate in a two-way interaction with the process.

合作伙伴可以将服务提供给流程，也可以向流程请求服务，或者参与到流程的双向交互中。

youdao

So, two-way interaction.

所以这是种双向互动

耶鲁公开课 - 死亡课程节选

An illustration of a telephone talking to a fax machine left him none the wiser, nor the idea that "storing results of a two-way interaction to a central location" was something that his applications had copied from the American firm.

BBC: Do the patent wars threaten innovation?