By default, the end-of-file string is an underscore (_); if that character is sent as a single input argument, everything after it is ignored.

缺省情况下，文件结束字符串是下划线(_)；如果将该字符作为单个输入参数来发送，则它之后的所有内容将被忽略。

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Task 2 has a single input criterion, in which two connections end, acting as an implicit join.

Task 2具有一个输入条件，其中接入了两个连接，可充当隐式的join。

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