Plus and minus signs were used in 1514 in Holland.
1514年，荷兰开始使用加号和减号。
In 1514 he showed it privately to his friends.
在1514年他私下显示了它给他的朋友。
In 1514 he showed it privately to his friends.
1514年，他把他的新理论私下里给他的朋友们看。
So between 1510 and 1514 he worked on it, gradually improving his theory until he felt it was complete.
因此在1510年和1514年之间他工作了对此，逐渐改进他的理论，直到他感到它是完全的。
So between 1510 and 1514 he worked on it, gradually improving (improve)his theory until he felt it was complete.
于是，他在1510 年至1514 年期间从事这项研究，逐步改善提高他的理论，直到他感到完善时为止。
Copernicus's first speculations on the subject appear in a 40-page booklet printed before 1514, which he circulated to some friends and colleagues.
哥白尼的第一个推测出现在印于1514年前的一本40页的小册子上，他把小册子分发给了他的一些朋友和同事。
Copernicus's first speculations on the subject appear in a 40-page booklet printed before 1514, which he circulated to some friends and colleagues.
哥白尼的第一个推测出现在印于1514年前的一本40页的小册子上，他把小册子分发给了他的一些朋友和同事。
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