这些不是丢弃在干燥森林中的烟头而是在森林中爆炸的运油车，沃利森先生如是说。
These were "not a cigarette butt being dropped in a tinder-dry forest" but "a gasoline truck exploding" in the middle of one, Mr Wallison says.
包括Cascades东部在内的干燥森林，对树木的砍伐和保护使它们成长得不自然的密集。
Many drier forests, including here east of the Cascades, have grown unnaturally dense after logging and efforts to save them from wildfires.
然而由于气候干燥，森林从定居点附近退去。
However, as the climate dried up, the forests retreated from the vicinity of the settlement.
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