The framework implements the same concepts of asynchronous component, vat, and promise as the E programming language.

框架实现了与 E 编程语言相同的异步组件概念、vat、和 promise。

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I. e. when cargo leaves a port for Shanghai to be relayed, the cargo can be viewed as exported, and can claim VAT rebate in advance.

上海努力争取的港运退税政策，是指国内货物只要确认离开启运港口发往上海港，即被视同出口并办理退税。

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