urban afforesting and greening的用法和样例：
例句
- The soil seed bank of urban green land contains some potential populations, some plants can be used for city afforestation.
城市绿地土壤种子库中蕴藏着一些潜在种群，有些植物种可以用于城市绿化建设。 - Recent efforts toward the greening of our cities have achieved much, although the results are still far from satisfactory.
对我们的城市绿化最近作出的努力取得了许多成绩，但结果仍然远远不能令人满意。
