If the data or control flow in and out of activities is relevant to understand the cause of the modeling error, we use the notation in the upper half of the figure.

如果活动内外的数据或控制流与理解导致建模错误的原因有关，我们将使用此图上半部分中的符号。

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TCP is connection oriented, and provides error and flow control.

TCP是面向连接的，并提供错误和流量控制。

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In chapter four, describes the bus management, and discussed the implementation of data transfer, flow control and error control in the network-stye instrument bus.

第四章讨论总线管理，阐述了数据传输、流量控制和差错控制在网络式仪器总线中的实现。

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