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.
學(xué)者讀書獲得知識 。
2.Their analysis included monitoring wind trajectories to detect how far the microbes may have travelled.
trajectory 軌跡
None of it has changed the trajectory.
沒有任何東西改變我們的軌跡 。