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The new BMW 3 Series has very well-equipped chassis protection, and the use of large-area protective plates prevents the oil pipeline from being directly exposed to the bottom of the vehicle. On the other hand, the lower part is equipped with a whole metal guard plate (for the convenience of chassis shooting, the guard plate has been removed and is not shown on the figure), which can provide strong protection for key parts such as engine oil pan. In addition, the guard plate can also comb the airflow passing through the chassis, thus improving the handling performance.晚宴开始了吗？范依兰抬头询问，希望还能有时间来劝阻父亲。《勇往直前的我们》是2022年一季度湖南卫视重磅企划大型消防教育节目，聚焦平凡英雄、走入人间烟火，打开消防员们的世界去看不一样的热血青春。If you make a turn along the famous subway line, you will basically reach it.在儿科轮转的一年住院医生唐雨佳，个性倔强又有点儿二，她终极梦想是当一名外科大夫，却没想到“沦陷”在小儿科。唐雨佳先是遇到了专业上无比严苛的导师叶梅，在她的挑剔和“打压”之下，唐雨佳在业务上急速成长。随后，唐雨佳遇到了儿科“一把刀”褚子键，这个男人专业上的强势和生活上的困窘形成了强烈的对比，唐雨佳无可救药的爱上了他，为此不惜和家人反目。然而褚子键在经历过痛失爱女之后，并没有选择雨佳，而是理智地选择了一个更合适他的人：初恋情人叶梅。在经历几番苦痛之后，唐雨佳与儿科主任钟琴的儿子申赫相爱了，但钟琴十分强势，她非常喜爱雨佳，但却强烈反对她成为自己的儿媳。唐雨佳在儿科的轮转即将结束，她体会到了儿科医生们的艰辛，最终被钟琴对患儿们的无私和热爱打动，决定留在小儿科，做一名称职、有坚守的儿科大夫。Yunnan ProvinceNow, let's imagine why these "checkpoints" are called "chains" in iptables. As we know, The purpose of a firewall is to match "rules" for passing messages, Then execute the corresponding Action, So, when the message passes through these checkpoints, You must match the rules on this level, However, there may be more than one rule on this level, But there are many rules, When we put these rules in a chain, A "chain" has been formed. Therefore, we imagine each "checkpoint" as shown in the following figure. In this way, it is more appropriate to call them "chain". Each message passing through this "checkpoint" must match all the rules on this "chain". If there are qualified rules, the corresponding actions of the rules will be executed.