Objective to explore the feasibility and significance of using ventilated technology of oxygen after unchaining in assistant breathing equipment cycled with mixed gases of helium and oxygen .

目的是通过循环式氦氧混合气辅助呼吸装置设计中的氧浓度解耦控制技术的研究，探索循环混合气技术在呼吸支持设备中应用的可行性及其重要意义。

Along with unchaining the ban of entry , the inburst of immigrant brought along thedevelopment of agriculture and a mass of superfluous farm produce provided the founditionfor the development of business .

随着封禁政策的解除,移民的涌入带动了农业的发展,大量剩余农产品为商业发展准备了物质基础。