The API recognizes that synchronous data sources are both necessary and common. The application should not be forced to always accept the performance cost of asynchronous scheduling simply because that's the only option provided. At the same time, mixing sync and async processing can be dangerous. Synchronous paths should always be an option and should always be explicit.
Six planets are set to parade across the sky this weekend in a rare celestial spectacle, experts have said.，更多细节参见服务器推荐
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