若要使用这个库，可以打开此文档并读取文件，然后依次循环主控制块内的每个块，如清单1所示。
You use the library by opening the document and reading the file, followed by looping through each block in the main control block, as shown in Listing 1.
若要使用这个库，可以打开此文档并读取文件，然后依次循环主控制块内的每个块，如清单1所示。
You use the library by opening the document and reading the file, followed by looping through each block in the main control block, as shown in Listing 1.
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