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.
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（一）核心保护区允许开展的活动；
In the Sicilian town of Giarre overlooking Mount Etna, Andrea Passanisi, a tropical and citrus fruits producer, uses an unusual fertiliser on his 100-hectare (247-acre) stretch of land: volcano ash.