循环的英文：
circle
loop
circulate
- The seasons rotate.
四季循环。 - loop initialization
循环初置(初始状态的),循环初始化 - The backwater recirculates
回水是反复循环。 - The refrigerant in a household refrigerator also undergoes a cyclic process
家用冰箱的致冷剂，也经历循环过程。 - Exercise helps the blood and other body fluids to circulate.
锻炼帮助血液和其它体液循环。 - The last figure of the decimal 0.63 repeats.
小数0.63的末位数是循环的。 - Although oxygen does not participate directly in the citric acid cycle, the cycle operates only when O2 is present.
尽管氧气没有直接参与三羧酸循环，循环却只有在氧气存在时才能进行， - This material is recyclable and will not pollute the environment.
这种材料是可循环利用的，因而不会污染环境。 - Oxaloacetate is formed in the last step of the citric acid cycle by the NAD+-dependent oxidation of L-malate.
草酰乙酸在三羧酸循环的最后一步通过NAD+-依赖的L-苹果酸的氧化来合成。 - "Wet beriberi is more acute, with edema from cardiac failure and poor circulation."
湿性脚气病病情较急，会有心力衰竭、循环不良及主要由此造成的水肿。
n. 圆，环；周期；循环；圈子
v. 盘旋；环行
- circle of longitude
经度圈;经度圈;黄经圈;黄纬圈 - circle of declinatio
赤纬度盘;赤纬圈;时圈 - This is a chord of a circle.
这是个圆的弦。
n. 环，圈；回路；弯曲部分；翻筋斗
v. 打环；以环连结；（使）翻筋斗
- The airman looped the loop eight times.
那位飞行员作了八次翻筋斗的飞行表演。 - The plane looped the loop three times.
飞机连翻了三个跟头。 - Loop the tree with a rope = loop a rope around the tree
将绳子卷绕于树
n. 循环，环行；传播，流传；流通；在人群中周旋；发行，销售
- Have you been circulated with details of the conference?
你收到会议详情的通知了吗？ - circulate counterfeit coins
使伪造的钱币流通 - This magazine has a large circulation.
这本杂志发行量很大。