劍橋詞典the movement of sand and small stones , etc. along the coast by waves travelling parallel or at an angle to the coast 沿岸漂移（海浪以與海岸平行的方向，或以與其成一定角度的方向運(yùn)動(dòng)，推動(dòng)沙粒和小石子等沿著海岸前進(jìn)） 返回 longshore drift