some birds have good eyes which can see through great distances. also, they can hear sounds which people cannot hear. but people have made new ears and new eyes for themselves. today, one can talk with a person on the other side
↑(a)
of the earth by telephone. through the radio one can hear sounds which come through space from thousands of miles
↑(b)
away. one can see the mountains on the moon through a telescope, and thousands of living things in a drop of water
↑(c)
through a microscope.

각각의 one이 다른 의미를 가지고 있나요 ? 아님 같은 의미를 가지고 있나요 ?
one이 가리키는 것이 무엇인지 정확한 답변 부탁 드리겠습니다.