selection thinning

例句：

1. 1. The farmer carefully selected the best apples for the market.
   农民仔细挑选了最好的苹果准备上市。
2. 2. The tree needed to be thinned out to ensure its health.
   这棵树需要被疏枝以保持其健康。
3. 3.The gardener decided to prune the rose bushes to improve their shape.
   园丁决定修剪玫瑰灌木来改善它们的形态。