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- He proved there is a natural isomorphism:where k is a perfect field of characteristic p, W(k) is the Witt ring of k, K is the fractional field of W(k), K|- is a fixed algebraic closure of K, K~(cyc) is the exension of K by joining all roots of unity. 是K的一个固定的代数闭包，K~(cyc)是K添加所有的单位根。 在我们的研究中，特征0的问题与特征p的问题经常是相互转化的，如在第一部分，我们必须将特征p的域提升至特征0；
- The field artillery pounded away at the for tress. 野战炮兵连续炮击那座要塞。
- Nothing in the world is flawless and perfect. 世上没有十全十美的东西。
- The weather during our holiday was perfect. 我们度假时的天气好极了。
- The project is far from perfect. 这项企划很不完美。
- The crowd cheered as the teams entered the field. 球队入场时观众们为之欢呼。
- What's the secret of baking perfect bread? 烤出好面包的秘诀是什么？
- On the map the drains of each field are laid sown. 地图上标有每一块地的排水沟。
- Right-handed batters usually hit to left field. 右撇子击球手把球打到左外野。
- He didn't have perfect attendance this year. 他今年有缺勤。
- I have perfect trust in my friend. 我完全信赖我的朋友。
- The runaway horse was cornered in a field. 那匹跑掉的马在田地里被圈住了。
- They live in perfect accord with each other. 他们生活在一起十分融洽。
- He has perfect poise and never seems embarrassed. 他的神智安宁，似乎从没困惑过。
- Tent is used by camper and by soldier in the field. 露营的人和战地的士兵用帐篷。
- On that occasion he looked a perfect fool. 在这个场合，他看起来就像一个大傻瓜。
- The children had a field day with their new toys. 孩子们玩新玩具玩得十分开心。
- The hat and shoes are a perfect match. 这顶帽子和鞋子完全相配。
- An oil well blew out in the oil field. 油田里有一口油井发生井喷。
- He is an adventurer in financial field. 他是金融领域的投机者。
