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.
虽然他们都比大卫先爬到树的一半，但最终他是最快到达树顶的。
Although they all made it halfway up the tree before David did, he reached the top of the tree fastest in the end.
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