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<strong>SNR</strong>-MC<br />
• One cloud or two clouds?<br />
1. One-cloud case needs large mass of<br />
MC>10^6 M_sun<br />
2. <strong>The</strong> separation of GeV <strong>and</strong> TeV emission<br />
favor two-cloud case.<br />
Further evidences are needed in observation,<br />
especially for explicit CO observation.