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Ecosystems can regain their balance even after huge changes, such as those caused by fire. In fact, fires clear away invading trees and shrubs. Fires also clear away the dead plants that pile up on the soil.
好玩极了
果然是高中读物啊～生词好少
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0 有用 乡愁 2011-07-11 16:24:17
Ecosystems can regain their balance even after huge changes, such as those caused by fire. In fact, fires clear away invading trees and shrubs. Fires also clear away the dead plants that pile up on the soil.
0 有用 轻吟浅唱的女子 2010-03-24 20:14:26
好玩极了
0 有用 genuine fan 2013-03-03 14:53:01
果然是高中读物啊～生词好少