The fluorescent screen of a TV set, the seat and keys of a tape recorder, the lens of a camera, the bookshelf and the door frame of a refrigerator. These structural elements are placed in front of the object.

2. Side view:

From the side, it is obvious that the external structural characteristics of various models are mainly reflected in the front, carriage and wheels. Draw its horizontal side view, which can fully show the structural characteristics of each part.

3. Top view:

The structural features of stoves, tableware, books and track and field are all upward, so it is easy to identify them by drawing their top views.

4. Weekly view:

The outer contour of a sphere is circular at any angle, and when their axes are perpendicular to the ground, cylinders and cones will also show roughly the same visual form at all angles.

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