如果你有花园，你可能已经了解了这些混合肥料的用处了。
If you have a garden, you may already know how useful compost is.
粪肥和混合肥料的使用几乎与农业同样古老。
The use of manure and composts as fertilizers is probably almost as old as agriculture.
粪肥和混合肥料的使用几乎与农业同样古老。
The use of manure and composts as fertilizers is probably almost as old as agriculture.
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