Cluster analysis of backward trajectory shows that there are mainly five types of trajectories affecting the particle size distributions at SDZ.
通过后向轨迹的聚类分析,将影响上甸子的气团主要分为五类。
参考来源 - 北京上甸子地区气溶胶数谱观测与研究·2,447,543篇论文数据,部分数据来源于NoteExpress
If that's all it knows, then in that scenario there is no building or anything else; it continues a trajectory both forward in time and backward in time, and it says that whatever seconds, one second before you set your clock to 0, it would've been on the ground.
如果是这样,在那种模式下,没有楼房或者别的什么,物体的运动轨迹可以沿时间可以向后延伸,也可以向前延伸,不管时间取什么值,在零点前一秒时,物体就在地面上
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