I go swimming every day in order to keep fit.

　　我每天游泳以保持健康。

　　Some teachers find it difficult to keep their classes in order.

　　有些教師覺得難以維持課堂秩序。

　　In order to get a complete picture, further information is needed.

　　為掌握全面情況，還需要詳細資料。

　　State your reasons in order of importance.

　　按重要性順序陳述你的`理由。

　　I must put my affairs in order.

　　我必須整理整理我的事務(wù)。