| 摘要 |
The cover (1) consists of a flat plastics plate divided into three elongated portions (2-4) by V-shaped grooves (5,6) with their sides sloping at 45 degrees. The side portions (2,4) may be hinged upwards with respect to the central portion (3) to make a square-section trough. A small square endplate (11) is hinged to the end of the central portion with a further V-shaped groove (7) so that it can swing upward to form the end of the box.
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