You must submit your claim within a reasonable time.

　　你必須在適當的時間內提出要求。

　　It seems only reasonable to ask students to buy a dictionary.

　　要學生買一本詞典，好像也沒什么不合情理。

　　I made them a reasonable offer but they turned it down flat.

　　我向他們提出一個合理建議，但是他們斷然拒絕了。

　　Public spending must be kept within reasonable bounds.

　　公共開支必須控制在合理的范圍內。

　　There's a reasonable prospect that his debts will be paid.

　　有理由相信他會償還債務的。