Input is fixed: You receive data in a pre-determined format.

输入端固定：接收的数据采用预先定义的格式。

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Output is fixed: you can control the input data format but must output data in a specific format, over which you have no control.

输出端固定：可以控制输入数据格式，但输出数据必须采用您不能控制的特定格式。

youdao

Output is fixed: you can control the input data format but must output data in a specific format, over which you have no control.

输出端固定：可以控制输入数据格式，但输出数据必须采用您不能控制的特定格式。

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