| 摘要 |
<p>To prevent cats and dogs from entering playgrounds for children and to avoid breaking of window panes by balls or such like, a playing cage is built on the playground. This cage comprises posts (1), girders (2), net shaped side walls (3) and a net shaped roof (4) suspended from a bracing wire (7) strained between two opposite span poles (8, 9).</p> |
