Bark beetles in lodgepole pine used to be more selective, leaving the younger and healthier trees alone.

海滩松上的树皮甲虫会有选择性地寄居在松树上，避开年轻健康的松树。

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Bark beetles in lodgepole pine used to be more selective, leaving the younger and healthier trees alone.

海滩松上的树皮甲虫会有选择性地寄居在松树上，避开年轻健康的松树。

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