请教GWD5--文章首句的理解 (已看过以往贴子)

我想请教大家，首句是什么意思？

作者提及mountainside slides of mud or snow有什么用意呢？

是不是，mountainside slides of mud or snow 也可以promote the survival of aspen trees?

只是作用不及fire 明显啊？

Even more than mountainside slides

of mud or snow, naturally occurring forest

fires promote the survival of aspen trees.

Line Aspens’ need for fire may seem illogical

(5) since aspens are particularly vulnerable

to fires; whereas the bark of most trees

consists of dead cells, the aspen’s bark

is a living, functioning tissue that—along

with the rest of the tree—succumbs quickly

野火，较之于雪崩和泥石流更常见，。。。

前面的even more than...作定语吧。

星星月亮终于出现了！谢谢！！

但是，“常见”对应的是那个单词啊？

Even more than mountainside slides of mud or snow, (but转折！)naturally occurring forest fires promote the survival of aspen trees.（尽管自然火灾事故发生得更多，但却有利于a树的生长，奇怪的现象，第二段正好解释）

偶得理解。。。