[译] 他拾起老人的帽子并摔掉了帽子上的灰尘。
[误] He picked the old man’s hat up and dusted it.

[正] He picked up the old man’s hat and dusted it.
[注] pick up 表示“拾起”,当它的宾语是代词时,应放在 pick 与 up 之间;如宾语是名词,尤其是比较长的词语时,应放在 pick up 之后。