她及时跑了出去，看到半英里宽的泥沙从山上轰隆隆地向他们冲来，撞翻了几百棵树。
She rushed outside in time to see a half-mile wide mud and sand thundering down the hill toward them, knocking over hundreds of trees.
当一棵树被连根拔起时，它可能会在倒下的过程中倒在其他树上，因此只会倒一半。
When a tree is uprooted, it might fall into some other trees on its way down, thus falling only partway over.
草、树和其他生物基原料是由纤维素、半纤维素以及维持植物外形的木质素组合而成的。
Grass, trees and other biomass feedstocks consist of a mixture of cellulose, hemicellulose and lignin, a tough material that helps plants keep their shape.
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