n. 山径；游径；踪迹（trail的复数）

n a track or mark left by something that has passed

n a path or track roughly blazed through wild or hilly country

n evidence pointing to a possible solution

v to lag or linger behind

v go after with the intent to catch

v move, proceed, or walk draggingly or slowly

v hang down so as to drag along the ground

v drag loosely along a surface; allow to sweep the ground