循环扩张(cyclic extension)是一类特殊的、结构较清楚的域扩张。设K是域F的有限次伽罗瓦扩域，若其伽罗瓦群G(K/F)为循环群，则称此域扩张为循环扩张，K/F为循环扩域。
长期的信贷扩张局面是否就此终结? —这个情况被马丁巴恩斯银行信用分析员称之为”超级债务循环”。
Has the long period of credit expansion—dubbed the “debt supercycle” by Martin Barnes of Bank Credit Analyst—come to an end?
当一个健康人在紧张时，神经系统会激发血管扩张，使血液循环增加，以满足身体的需要。
In a healthy person who is under stress, the nervous system triggers a widening in the blood vessels so that blood circulation increases to meet the body's needs.
在皮肤，结果将是气温升高的真皮，毛细血管扩张，并刺激血液循环。
In skin, the result will be elevated dermis temperature, expanded blood capillaries, and stimulated blood circulation.
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