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Purposeful practice is not enough//043大概二十来分钟后，他猛然站了起来，眼中闪过激动，兴奋之色溢于言表。Action: Blow a kiss.岁月荏苒，杜拉拉早已不是那只升职路上匍匐前进的职场菜鸟，她坐镇SH人事经理已驾轻就熟，不日就要问鼎总监级别；和王伟的甜蜜恋情瓜熟蒂落，领证结婚过上了幸福的二人世界。不料，一个简直是为杜拉拉量身定做的敌人凯西横空出世，空降公司和拉拉竞争人事总监。凯西二十妙龄，三十岁的拉拉惨被划归老女人阵营。工作上狭路相逢勇者胜，杜拉拉决定赌上三十岁女人的尊严和凯西拼了！但让杜拉拉万万没想到的是，凯西的猛烈旋风竟还席卷向她的家庭生活。原来凯西和王家相识已久，她是王伟妈的得意门生，王伟心目中的萌妹子，更因缘凑巧搬到了拉拉家楼下。“嘀嘀嘀”超级警报拉响了，试看女汉子杜拉拉如何打败劲敌，杜拉拉的职场婚姻双重战斗欢笑登场！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.