不同之处在于，当蓝色SHIP返回的行接收完毕之后，粉色SHIP返回的结果集很可能也已经准备就绪，可以马上从远程数据源获取。
The difference is that by the time the rows from the blue SHIP have been received, the result set of the pink SHIP is hopefully ready and waiting to be retrieved from the remote source.
每个select调用返回一组事件，指出新客户机可用；新数据准备就绪，可以读取；或者客户机准备就绪，可以接收响应。
Each call to select returns a collection of events indicating that a new client is available, new data is ready to read, or a client is ready to receive a response.
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