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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.　　实际上表面看似十分开心的杜哲内心却很忧郁。他从小失去父爱，母亲又不管他，而且还没有朋友交往。他老是盯着史蒂芬不放无非就是为了找寻友谊，安慰孤寂的心灵。因此，当他听清了史蒂In the "Video Learning" section, there are the first video, short video, simulcast channel, theory, party history, massive open online course, characters, culture, literature and art, science, nature, TV series, movies, rule of law, military and other channels. Among them, the "first video" is mainly a video report on the relevant activities of General Secretary Xi Jinping. As its name implies, "simulcast channel" is CCTV news simulcast video. Massive open online course is a free public video course with a variety of courses.Ctrl + J: Repeat the previous command田遥懵了：没做错？红椒点头道：没错。故事讲述了一位名为“蓝天”的俗家弟子，于少林寺经过武艺的修炼后，下山除奸伏恶，而后发生一连串的传奇故事，并且领悟了各种少林绝妙武学。 故事除了趣味剧情外，还刻划了许多功夫动作的武打场面，呈现了少林武学内外兼修的禅武合一精神。有一个人注定要和你相遇，有一点心动，却意外变成伤痛，有一种勇气改写谁的命运，有一些回忆能否被爱唤醒，为失忆的樱花《祈祷爱情》。