以trick down 向下流淌为例:
To make the gains of innovation better trickle down (to) people
trickle是vi.,所以后面加介词跟宾语,但是为什么还要加个介词to呢?有什么差别吗?
同理,像 stream down (to)
trickle down 是一个短语动词,可以与介词 to 连用。如:
They believe that the benefits of the tax cut for corporations should eventually trickle down to the average consumer. 他们相信减税给企业带来的利益最终会向下渗透,惠及普通消费者。(《韦氏高阶英汉双解词典》2017年1月第1版)