selective availability

例句：

1. 1. The government's policy of selective availability has led to a shortage of certain medical supplies.
   政府的选择性可用政策导致了某些医疗用品的短缺。
2. 2.In agriculture, selective availability refers to the practice of selecting and breeding plants for specific traits.
   在农业中，选择性可用是指选择和培育具有特定特性的植物。
3. 3.The selective availability of resources is a major factor influencing economic growth.
   资源的选择可用性是影响经济增长的主要因素。