真實譯文摘錄（Sample of real translation）：
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由于應(yīng)力波在活立木與原木中傳播過程和傳播形式存在差異，在兩者之間的傳播機理或理論尚未完全明晰，導(dǎo)致尚無法實現(xiàn)通過檢測活立木的力學(xué)性能來預(yù)測和評價相對應(yīng)原木的品質(zhì)等級。
Due to the differences in the propagation process and mode of stress waves between standing trees and logs, the underlying propagation mechanisms or theoretical frameworks connecting the two remain insufficiently understood, making it infeasible to accurately predict or assess the quality grade of logs solely based on the mechanical properties of standing trees.
需要注意的是，對于不同髓心、心材和邊材比例的活立木模型，應(yīng)力波的敲擊產(chǎn)生輸入點位于模型的左下角。
It is important to note that for all standing tree models with different proportions of pith, heartwood, and sapwood, the point of impact generating the stress wave is located at the lower-left corner of the model.
隨著傳播時間的增加，應(yīng)力波傳播距離也逐漸增大，波陣面的曲面越來越長，但傾斜程度逐漸減小，到最后波陣面變短，逐漸變成平面形狀，并逐漸與活立木的長度方向垂直。
As the propagation time increases and the stress wave propagates farther, the curved surface of wavefront elongates, while its inclination gradually decreases. Eventually, the wavefront shortens and transitions into a planar shape, becoming more perpendicular to the lengthwise direction of the standing tree.
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