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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，是法律文书常用副词，其为“立即”的意思，例：The outstanding sum should be settled forthwith.（应该立即清还所欠的款项）。其实，所谓立即，可以理解为最短的合理时间。