1.These are pollutants or particles derived from human activity, or dust from other continents.
derive from 源自
A scholar derives knowledge from reading.
学者读书获得知识 。
2.Their analysis included monitoring wind trajectories to detect how far the microbes may have travelled.
trajectory 轨迹
None of it has changed the trajectory.
没有任何东西改变我们的轨迹 。