The simplest approach is to check every single point. Compute the distance from the user's location to every restaurant in the database, keep the ones that are close enough, and throw away the rest.
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，这一点在Line官方版本下载中也有详细论述
await blocking.writer.write(chunk4); // waits until consumer reads
In a letter to Environment Secretary Emma Reynolds, he warned of "ecological catastrophe" if such waterways were not protected.