我们的车被一棵倒下的树挡住了路。
大路上一棵倒下的树是障碍。
一棵倒下的树损坏了屋顶。
内德跳过一棵倒下的树。
倒下的一棵树挡住了部分道路。
几乎每隔一分钟，我就会听见又有一棵树倒下时发出的折断声、噼啪声和塌倒声。
Every minute or so I could hear a snap, a crack and a crash as another tree went down.
然而，假定在这只良种猪产出小猪以前，它被一棵倒下来的树压死了。
However, suppose that a tree falls on the superior pig before it has produced offspring.
然而，假定在这只良种猪产出小猪以前，它被一棵倒下来的树压死了。
However, suppose that a tree falls on the superior pig before it has produced offspring.
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