当时，四个身穿白色泰维克工作服的年轻人将带有芳香气味的骨粉团与表层土混在了一起，盖上防水布，然后就度周末去了。
Four young men, each wearing white Tyvek coveralls, topped some of the redolent mixture with topsoil, put tarps over the rest and left for the holiday weekend.
正是在这一阶段，堆肥变成良好的、疏松芳香的腐殖质土。
It is during this stage that the compost turns into good, crumbly fragrant, humus earth.
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