If they kept on going, and the next night they saw the pair of stars setting separately, then they would know that they were at a different degree of latitude.
如果他们继续走,第二天晚上看见这两颗星星分别落下,就知道他们在不同的纬度上了。
2
Gradable antonyms: Some antonyms are gradable because there are often intermediate forms between the two members of a pair. This is a matter of degree.