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Secondly, we should improve our concentration and use fixed time, do fixed things and not be disturbed to improve our concentration.只得收缩战线，采取防守姿态，不与楚人直接交战，同时向司马欣发出了求援信。　　特殊的身份令双珠常常在公阳里充当家长的角色，妓女们之间的争风吃醋需要她平息，惹上身的人命官司也需要她出面排解。B) Design principles. Many people have listed seven principles, such as single duty principle, opening and closing principle, Richter substitution principle, dependence inversion principle, interface isolation principle, composite reuse principle and Dimit principle. LSP, I elevated it to one of the three cornerstones of the object-oriented paradigm; Single responsibility and interface isolation are mainly used as the principle of responsibility division in object-oriented analysis/OOA, which you can not pay much attention to at this time. Relying on the inversion principle, I throw it away as garbage, because the opening and closing principle or directly "relying on abstract type principle" already contains the essence of relying on the inversion principle, while the dross of relying on the inversion principle is inherited by IoC. Of course, the pullback, I emphasize very much. Therefore, you need to master the abstract dependency principle (OCP), one-way dependency principle (including the learning of callbacks) and the minimum dependency principle (composite reuse principle, Dimit rule).不如你跟秦大夫在这住几晚上，反正你们家有人看着，也没啥大事，不比我们，家里一堆事，再说我们也常来这的。