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关注：1
2013-05-23 12:21
求翻译：For many decades, the policy of the United States Forest Service was to prevent all tires. The policy began to be questioned in the 1960s, when it was realized that fire is an essential part of the life cycle of some trees. This produced the policy of controlled burns to educe underbrush. This cleared much of the under是什么意思？ 待解决
 悬赏分：1
- 离问题结束还有
For many decades, the policy of the United States Forest Service was to prevent all tires. The policy began to be questioned in the 1960s, when it was realized that fire is an essential part of the life cycle of some trees. This produced the policy of controlled burns to educe underbrush. This cleared much of the under
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2013-05-23 12:21:38
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2013-05-23 12:23:18
几十年来,美国的政策是森林服务,防止所有轮胎。 该政策将开始质疑在1960年代,因为认识到,一个重要部分是火的生命周期的一些树。 这次会议产生了政策的作用究竟有多大?茅草烧控制。 这一清除杂草的大部分通过森林和林地,使旅行和狩猎更容易在减少风险的危险大强度引起的火警建设多年的燃料。
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2013-05-23 12:24:58
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2013-05-23 12:26:38
许多几十年来，美国森林服务的政策是为了防止所有的轮胎。这项政策开始受到质疑在 1960 年代，当它实现了，火是一些树木的生命周期的一个重要部分。这产生了控制烧伤引出树丛的政策。这清除了很多的树丛通过森林和林地的领域，使旅行和狩猎的同时降低风险的危险高容易得多 — — 强度多年的燃料积聚所造成的火灾。
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2013-05-23 12:28:18
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