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Through the management of the connection pool, the sharing of database connections is realized, and the connection does not need to be recreated every time, thus saving the overhead of database recreation and improving the performance of the system!Luo Jian, Founder of Spark Thinking: "In the early days, the organization of the online thinking ability track, Basically, they have independently developed live broadcast systems, Therefore, the entry threshold for this track has been further raised. For entrepreneurs who still wish to enter this track, in addition to the construction of the teaching and research system and the polishing of the course content, it will also be essential to have a self-developed live broadcast system, because the use of a third-party live broadcast system will have a relatively poor user experience, which is not conducive to the perfection of their own courses and services, and the market competitiveness is relatively low. "胡钧探头对山下望了一眼。Finally, I hope every photography lover can take satisfactory and exquisite photos.深夜时份，一对情侣在湖水中央裸泳，突然被漩涡卷走，其后再发生多宗地层下陷意外。地质学家莲娜认为事有蹊跷，于是深入追查，几经艰辛，终于发觉问题可能源自一个荒废的矿场，该矿场多年前曾发生灾难，有多人死亡，其中一人就是莲娜的哥哥。于是她决定与几个朋友深入矿洞探个究竟。原来矿灾之后，矿场东主并未进行填塞工程，令地底出现一个大洞，导致地面的塌陷事故。 　　事情尚未解决，危机日益增加，公路地层开始下陷，市内的医院和球场出现裂痕，随时倒塌。另一方面，在矿井内进行研究的莲娜决定用炸药炸毁岩层，希望利用砂石填补大洞，阻止地面继续下陷……… 剧集《卢克·凯奇》中，这位天赋异禀的角色在纽约市黑人聚集地哈莱姆区重拾生活的过程中，被迫与他所在城市的核心人物，也就是马赫莎拉哈什巴兹·阿里饰演的Cornell Stokes展开斗争，而这一切都迫使他再度面对他想埋葬的过去。 　　卢克·凯奇这个角色首次出现在《杰西卡·琼斯》之中，他是杰西卡·琼斯的爱人。在剧集中，卢克受重伤在被杰西卡送到医院时，遇到罗莎里奥·道森饰演的Claire Temple，Claire负责照顾卢克直到他清醒。而在《卢克·凯奇》中，观众将继续看到罗莎里奥·道森的身影，而饰演杰西卡·琼斯的克里斯滕·里特将不会参演。