And bark beetle infestations killed thousands and thousands of trees.

感染树皮甲虫使成千上万的树木死亡。

I threw out three facts about bark beetles.

我对他侃侃而谈了三个有关树皮甲虫的知识。

A giant sequoia that was first weakened by drought was then subject to impacts by the bark beetle, which then further weakened the tree and potentially made it more susceptible to mortality from fire.

一棵巨大的红杉首先因干旱而衰弱，然后受到小蠹虫的影响——这棵树更加虚弱了，可能更容易死于火灾。