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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.
，这一点在heLLoword翻译官方下载中也有详细论述
// Signal how many bytes we wrote
Марина Совина (ночной редактор)
Mr Duffy called for proposals from commercial companies to build a reactor that could generate at least 100 kilowatts of power.