雷暴雨滚滚而来，树形仙人掌依然挺立。干燥地区的闪电增加了灌木丛火灾风险。
Saguaro cacti stand in the desert as a thunderstorm rolls overhead. Lightning in dry areas increases the risk of brush fires.
如果气候变化才是森林火灾日益严重的主要原因，那么清除灌木丛本身是没有多大帮助的。
Clearing bush by itself won't help much if changes in climate are largely responsible for increasingly severe forest fires.
零星、频繁的火灾清空了下层灌木丛以使得更大的、会毁坏树木的灌木不会壮大，它的这个角色已经被认识到了。
The role of small, frequent fires in clearing out the undergrowth so that larger, tree-destroying ones will not eventually take hold is now understood.
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