noun
grammar 语法副词小词，副词小品词（尤用于动词后，表示位置、运动方向等） an adverb used especially after a verb to show position, direction of movement, etc.
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。
adverbial particleadverbial particleadverbial particle