For example, to get input, we may need to specify the file or device to use as the source, and the address and length of the memory buffer into which the input should be read.

• 译文：例如，为了获取输入，我们可能需要指定文件或设备作为信息来源，并且要把地址和内存缓冲区的长度放到输入读取的位置。