[tóng shí]
[副]
（同一個時間） at the same time; simultaneously; concurrently; in the meantime; meanwhile; in the interim; per interim
exist simultaneously; exist side by side
同時存在
happened at the same time; coincide; concur; synchronism
同時發生
[連]
（并且） moreover; besides; furthermore
The task is arduous; besides, there's not much time.
任務艱巨，同時時間又很緊迫。