| 摘要 |
The cultivation surfaces (5, 6, 7, 8) are arranged above the collection tank (2) in fours so that one pair of cultivation surfaces (5, 6) is modified at a slant of 1 to 3% from the outlet (4) of the delivery pipe (3) on both sides downwards. At the ends of these cultivation surfaces (5, 6) there are collection channels (9, 10) slanted towards the second pair of cultivation surfaces (7, 8) situated, at a view from above, next to the first pair of cultivation surfaces (5, 6) and, at a lateral view, below them, whereas the second pair of cultivation surfaces (7, 8) is modified with a slant of 1 to 3 % from the outer perimeters (11, 12) to the collection tank (2).<IMAGE>
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