through their traction effect
The results imply that, together with the pine"s vertical roots, the lateral roots of the pine trees, through their t raction effect, are able to mitigate against shallow instability in the forested slopes, such as shallow slide and creep, at a certain degree.
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through their traction effect
通过它们的牵引作用
以上为机器翻译结果，长、整句建议使用 人工翻译 。