Strowger selector

例句：

1. 1. The Strowger selector is an essential tool for plant breeders.
   Strowger选种机是植物育种家必不可少的工具。
2. 2. The Strowger selector has greatly improved the efficiency of seed selection.
   Strowger选种机大大提高了种子选择的效率。
3. 3. The Strowger selector was designed to select the best strains from a large population of plants.
   Strowger选种机设计用来从大量的植物中挑选出最好的品种。