设S是复数集的非空子集。如果S中的数对任意两个数的和、差、积仍属于S，则称S是一个数环。例如整数集Z就是一个数环，有理数集Q、实数集R、复数集C等都是数环。 由于有理数集Q、实数集R、复数集C有更好的性质，所以他们还是数域。
利用数域上一元多项式环与整数环相似的性质，建立数域上一元多项式环中的孙子定理，并给出它的简单应用。
Using the similarity between polynomial ring and integer ring the paper establishes Sunse's Theorem in the polynomial ring in number field, and offers its brief learning and practice.
尽管凯斯·希勒全国房价指数及十大城市综合指数与去年相比有所上扬，但是截止到三月末的连续三个月这一指数环比连续下挫。
Although both the Case-Shiller national and ten-city indices are up year-on-year, the national index fell during the three months to the end of March.
4月26日，星期二，晚上，海豹小组在距Dam Neck数英里外的海军航空站oceana登上了一架波音c - 17环球霸王运输机。
On the night of Tuesday April 26th the SEAL team boarded a Boeing C-17 Globemaster at Naval Air Station Oceana a few miles from Dam Neck.
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