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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
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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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