seminal stain

例句：

1. 1. The scientist discovered the first seed of a new species.
   科学家发现了一种新物种的第一个种子。
2. 2. The plant's seed is small and hard to find.
   这种植物的种子很小，很难找到。
3. 3.The farmer sowed the seeds in the field for the next year's harvest.
   农民在地里播种了种子，为明年的收获做准备。