an adverb used especially after a verb to show position, direction of movement, etc.副词小词，副词小品词（尤用于动词后，表示位置、运动方向等）
In ‘come back’, ‘break down’ and ‘fall off’, ‘back’, ‘down’ and ‘off’ are all adverbial particles.在 come back、break down 和 fall off 中，back、down 和 off 都是副词小词。🔊🔊