我们把落叶堆在一起，让它们自然分解成堆肥。
We piled up the leaves and let them ___compost naturally.
她在种植蔬菜前，先用堆肥改良了花园的土壤。
She ___composted the garden soil before planting vegetables.
他在后院开始堆肥，把厨余垃圾和树叶混合在一起。
He started ___composting in the backyard by mixing kitchen scraps with leaves.
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