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由于我们可以把松林的每木产脂力视为表示树木生命持久力的可靠性状,视为判断割面负荷率大小的标准,因此我们认为可以把负荷率分为三种。
Since we can think of the per unit yield of pine as a reliable indicator of the longevity of the tree, we can judge the load factor as three.