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3. Physical period: Uniform circular motion is a kind of periodic motion. The so-called periodicity refers to the fact that after a certain period of time, the moving object repeats back to its original position, and the instantaneous speed repeats back to its original size and direction. The time it takes for an object to move in a uniform circle is called a period. The period is expressed by the symbol T, and the period is also a physical quantity describing the speed of uniform circular motion. The long period indicates the slow motion of the object, while the short period indicates the fast motion of the object.原来按照郑家、张家和秦家商议的，这亲事要一切从简。眼睛碧油油的发光，手中拿着一根一丈六七尺长的两头狼牙棒，威风凛凛，犹如天神天将一般。Application scenario: Mediator mode is generally applied to situations where a group of objects communicate in a well-defined but complex way, and situations where you want to customize a behavior distributed in multiple classes but do not want to generate too many subclasses.　　由钟汉良、罗珊珊等精彩演出，感人至深的经典浪漫，感动偶像剧集，继《一米阳光》,《守候阳光》之后，海润“阳光三部曲”的终结篇。故事主要讲述了女主角桃园奈奈生因好赌而欠债的父亲不知去向， 被讨债的人赶出了家。在走投无路之时，她帮助了一位被狗追的懦怯的男人，得知她的遭遇后神秘的男人说出了「我把我的家转让给你吧。」这样出奇的话。无家可归的奈奈生虽然半信半疑，但还是前往了男人所说的住所……到了那儿发现那是一间荒废的神社。那懦怯的男人的正体正是离家出走的土地神。作为神社转让的代价，奈奈生开始了当土地神的新生活。