猪撞到了一棵树上。
Fruit tree farmers can buy one load of manure a year from a cow or pig farm to start their digester and add wood pruned from fruit trees.
果树种植户每年可以从养牛养猪户那里购买一批粪肥建起沼气池,然后添加修剪下来的果树树枝。
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。
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