Hi. I would love to help you, but I don't know what sth is. I looked it up, and I am not sure what the reference is in your question.
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AnonymousThe seeds mean the beginning of sth. I wonder why the plural is used with this sense.To sow ( such as lawn seeds) is to scatter them over an area of loosened earth for them to grow. Logically, we don't scatter one seed. So it only makes sense in plural.