TPO1里的一句话，是说snow有利于树的生长还是不利于?

TPO1里的一句话，是说snow有利于树的生长还是不利于?

This is because middle and upperlatitude timberlines are strongly influenced by the duration and depth of the snow cover. As the snow is deeper and lasts longer in the valleys, trees tend to attain greater heights on the ridges, even though they are more exposed to high-velocity winds and poor, thin soils there.

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但从这段看是有利树长高的

文中说因为 snow is deeper and lasts longer in the valleys（山谷中积雪更深持续更久），所以 trees tend to attain greater heights on the ridges（树在山脉中可以达到更高的高度）。even though是即使的意思后面跟着的不影响前半句的意思。

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