请教两个短语如何翻译（中翻英）假设对一堆石头进行筛选我如何用英文表示以下短语1.被筛选出去的石头2.筛选后留下的石头不能用从句的形式,谢谢了

1. the selected stones
2. the left stones after selection

1.被筛选出去的石头
the filtered out stones
2.筛选后留下的石头
the left stones after screening /filtering

1.the stones selected
2.the stones having been selected

请给上下文。。否则没法翻的

1.The selected stones
2.the remanent stones after selection

the selected stones
the left stones