1. Only in the earliest times, when there were very few humans about, may this not have been true. 문장에서요, about이 부사로 쓰인건가요?
2.Even more fascinating is the method by which salmon locate the entrance to their home stream, while swiming up a river. 문장에서 by which 가 관계사로 쓰이는데 by 가 왜 나오나요?
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2. 어떤 방법으로 라는 의미의 수단전치사 by 즉 by the method