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The Context class is a context class, and Plus and Minus are implementations for calculation respectively. The code is as follows:《小小熊》讲述的是两个不知疲倦的调皮鬼小棕棕和小小白的故事。 小棕棕喜欢小工具和技术，小小白则是大自然的宠儿。他们经常陷入窘境，但却总能在自己的朋友们的帮助下战胜所有的困难。年轻的观众们可以在游戏和幽默中轻松的学习到策略和方法！当然，只是名义上这样，实际上是去劝降王翠翘与徐海旧部。男人和妇人松了口气，并且满眼的惊喜和激动——捡了个儿子呢。Source: Baidu Encyclopedia-Just-in-Time SystemBIM technology can add time dimension to three-dimensional space model to carry out 4D simulation construction, which is conducive to the optimization of construction period. Based on BIM technology, 4D simulation construction can put forward a virtual construction scheme, which can pre-process various possible induced situations in the construction. The application of BIM technology in the construction stage can reduce possible errors in the process of information transmission and reduce rework.