Classification
GLΦ：The diameter of the tree-trunk on the ground．
Φ：The diameter of the tree-trunk in 100cm heigh
H：The height of the sapling
TH：The height of the tree-trunk
W：The ｗidth of the sapling
Φ：The diameter of the tree-trunk in 100cm heigh
H：The height of the sapling
TH：The height of the tree-trunk
W：The ｗidth of the sapling
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