封闭轨道 closed orbit 圆形或椭圆形的轨道 与之相对应的是open orbit （开放性轨道；脱离轨道）
此方程的封闭必须考虑颗粒扩散的轨道穿越效应、连续性效应和惯性效应。
To enclose the equation, the inertia effect, the crossing trajectories effect and the continuity effect of particle dispersion must be taken into account in the model.
通过分析人类的“绿色需求”，阐述轨道交通车站封闭空间设置绿色植物的重要性。
This paper discussed and analyzed the problems in the passenger flow organization of urban rail transit stations.
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