文章介绍了水平井拖拉器的基本结构及性能指标；

The basic structure and the specification of downhole tractor are shown in this paper, also, the logging techniques are summarized.

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将物理的服务器单元拖拉至虚拟镜像之中，以让服务器成为虚拟镜像的一个成员。

Drag the physical server unit into the virtual image unit to make the server a member of the virtual image.

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将工件拖拉到编辑器中的文件上。

Drag the artifact onto the document in the editor.

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