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This is the first sub!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.I nodded and motioned for him to talk about the battle. Zhang Xiaobo coughed lightly, cleared his throat and began to say:Unicom　　怀抱梦想的年轻乡村歌手贝利（凯萨琳·麦菲饰）眼见事业和私生活变调，只好接下新工作，替一个名叫博（埃迪·希布莱恩饰）的粗犷牛仔照顾五个小孩。她这位新手褓姆凭藉迷人的南方气质和愈挫愈勇的性格，从容应对雇主家庭的种种状况，充当他们缺席已久的母亲角色。但她却万万没有想到，这个具有音乐天分的家庭竟让她重圆星梦，组成她梦寐以求的乐团。1943 年，柏林夏里特醫院的職員奮力應付二戰及納粹政權的影響，包括優生學的醫療實踐。本片是吴宇森处于创作高潮期的野心作，大胆地将港片的视野推向战地越南，藉以拉大港产动作片的格局。梁朝伟、张学友和李子雄三人饰演在贫民窟长大的好友，他们在梁的婚礼上因为误杀抢钱的歹徒而被逼逃亡海外，到越南去从事走私活动。三个香港小混混走出西贡机场便见识到战争的残绘，他们辗转成为当地黑社会杀手，又被越共误为间谍，最后为了一箱黄金而互相反目。李出卖朋友带着黄金回到香港，成为企业巨子，梁处理了张的后事便回港报仇。本片在人物架构和部份场面的设计上明显地受到《越战猎尘人》的影响，但仍拍出火爆利落的动作特色，对吴氏一贯著重的"男性友情"和"出卖"主题也有很好的发挥。