at the time, it was the first one that was located inland and it was the first one to use artificial saltwater, that we now create our own man-made saltwater here.제가 알기로는 ,that은 못쓰는걸로 알고 있는데 이 문장에서 어떤 쓰임새, 문법으로 쓰였는지 궁금해요~
답변 부탁드립니다!!