下弧试验
Underarc test
以上为机器翻译结果，长、整句建议使用 人工翻译 。
试验区树荫运动轨迹呈蝶形弧带变化，树高影响投影外弧线位置，枝下高影响投影内弧线位置；
The trajectory of umbrage motion shaped a butterfly arc belt. The situations of outside and inner arc belt were influenced by height of tree (H) and the height below branch respectively.
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模块下移
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