pass by可以直接結尾，後面可以不加賓語，但是pass需要加賓語或者介詞
例句
pass by
They were injured when a parked car exploded as their convoy passed by.
他們的車隊經過時，壹輛停放著的汽車爆炸了，他們受了傷。
As they pass by, a piteous wailing is heard.
他們經過時，響起了令人哀憐的慟哭。
pass
As she passed the library door, the telephone began to ring
她經過圖書室門口時，電話響了。
He passed through the doorway into Ward B
他穿過門口進入B病房。
pass 英[pɑ:s] 美[p?s]
vt. 通過; 走過; 批準; 度過;
vt. 傳球; 及格; 發生; 不要;
n. 通行證; 通道; 關口; 越過;
[例句]As she passed the library door, the telephone began to ring
她經過圖書室門口時，電話響了。
pass by 英[pɑ:s bai] 美[p?s ba?]
[詞典] 經過; 過去; 疏忽; 以…為人所知;
[例句]I see them pass by my house every day
我每天看見他們從我家旁邊經過。