Forthwith——立即

a term found in contracts， court orders and statutes， meaning as soon as it can be reasonably done. It implies immediacy， with no excuses for delay.
    【注】 Forthwith，是法律文書(shū)常用副詞，其為“立即”的意思，例：The outstanding sum should be settled forthwith.（應(yīng)該立即清還所欠的款項(xiàng)）。其實(shí)，所謂立即，可以理解為最短的合理時(shí)間。