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，这一点在Line官方版本下载中也有详细论述
The first step is to specify which APIs our application needs. This is done using an IDL called WIT. For our example, we need the Console API. We can import it by specifying the name of the interface.
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// 4. 将当前索引压入栈，维护单调递减特性（供后续价格计算跨度使用）