流的最大特点就是所有数据的传输都是按照数据序列的顺序进行的。每个数据必须等待排在它前面的数据读入或送出之后才能被读写。-Flow is most characteristic of the transmission of all data are in accordance with the order of the data series. Each data row in front of it must wait for the data read or write in order to be sent after.