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? Singleton pattern is the most common and simplest design pattern in design pattern, which ensures that only one instance exists in the program and can be accessed globally. For example, account information object management used in actual APP development? Objects (SQLiteOpenHelper) and so on all use singleton mode. This model has several advantages:突然，砰砰的声响从大厅中传来，只见吕馨气喘吁吁，匆匆跑进来。就听见楼上响起了葫芦丝的声音，悠扬中带着一丝不耐烦，比刚才的撕裂声好多了。We began to test the effect of blending leaf juice with blue dye.Episode 15superstar？Yes，曾经的superstar。眼下的境况是知名度下滑+家族生意遇到瓶颈。一堆破事要怎么办？干脆到国外去散心探望朋友并学习经营之道。时来运转，贵人降临。可是这个懂得那么多的工人怎么老爱捉弄她?和他做朋友？似乎也不赖只是，事情真的仅仅就那么简单？是机缘巧合，还是命中注定？一切等待她回到泰国后，谜底终将揭晓"The first few hours of the battle were the same as before, We use all kinds of weapons in our hands in our positions. Strike the attacking Vietnamese troops, The exchange of fire was very intense, The front of the position was covered with the bodies of the Vietnamese army. We also have a lot of wounded on our side, However, after all, it is based on strong fortifications. More wounds, less deaths, In particular, the wounded are mainly minor, All of them can continue to fight without getting off the line of fire. At that time, my monitor was quite happy. If you play like this, There's not much pressure to hold position 149, The Vietnamese army that could fight could not even get close 400 meters away from the front of the position, As a result, it was only over an hour after he said this. I remember it was one or two o'clock in the afternoon. Something is wrong, The left and right wings of the position, It's two sparse rain forests, The positive was the same, But before the war, in order to facilitate the offensive forces to assault, All of them have been cut down by Vietnamese troops, But it also broadens our horizons, However, it is still unclear what is going on in the rainforest on both sides. Just when something was wrong, First I heard a "buzzing" sound inside, At first it was a little bit, Later it grew bigger and bigger, At last it was so big that it could almost cover the shot when it was fired. No one in our position knows what's going on, All of them stretched out their heads and looked in the direction of the sound. When the "buzzing" sound reached its peak, they saw that a large area of flying insects flew vertically from the rainforest on both wings. If the number were small, whether the sound or flying insects could not be heard or seen at this distance, but now they could hear clearly.