中文说明：这是一种包络线的实例特殊情况emd_blX-This is an example of envelope special circumstances emd_blx
English Description：
This is an example of envelope special circumstances emd_blx
This is an example of envelope special circumstanc
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中文说明：这是一种包络线的实例特殊情况emd_blX-This is an example of envelope special circumstances emd_blx
English Description：
This is an example of envelope special circumstances emd_blx