各位大侠：这个命令怎么用呀？
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帮助文档里的说法：我怎么就延伸不了呢？
1. On the Geom page, surface edit panel: select the extend sub-panel.
2. Ensure that the surfs selector under the heading surfs to extend is highlighted.
3. Select the surfaces to extend, either by picking them from your model or using the extended entity selection menu.
4. Use the surfs selector under the destination heading to choose the surfaces to which you wish to extend the ones chosen in the previous step.
5. Type a distance into the max. extension field.
Surfaces will not extend beyond this distance from their original edge locations.
Click extend.
1. On the Geom page, surface edit panel: select the extend sub-panel.
2. Ensure that the surfs selector under the heading surfs to extend is highlighted.
3. Select the surfaces to extend, either by picking them from your model or using the extended entity selection menu.
4. Use the surfs selector under the destination heading to choose the surfaces to which you wish to extend the ones chosen in the previous step.
5. Type a distance into the max. extension field.
Surfaces will not extend beyond this distance from their original edge locations.
Click extend.
nidongxiang 
