测试内容
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.. figure:: testing_list_1.PNG
    :scale: 50%
    :align: center

.. figure:: testing_list_2.PNG
    :scale: 50%
    :align: center

.. figure:: testing_list_3.PNG
    :scale: 50%
    :align: center

.. figure:: testing_list_4.PNG
    :scale: 50%
    :align: center