Canada is the only in which the numbers in prison have decre

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Canada is the only in which the numbers in prison have decreased over the period.
请问这种句型要怎么分析,which 前面的in 修饰什么,which又指代什么,请高手帮我理顺,晕死了...哎

加拿大是这一时期唯一服刑人数在减少的（国家）
Canada主语
is谓语
the only 表语指代加拿大
in which the numbers in prison have decreased 定语从句修饰the only,which指代一个国家在从句中作状语,前加in
over the period.时间状语
再问：我不太明白为什么要必须这么说 Canada is the only which the numbers in prison have decreased over the period . 可以吗，不知道为什么加IN
再答：定语从句变成单句为the numbers in prison have decreased in Canada in Canada 做地点状语Canada 作介词in的宾语，化为定语从句Canada 用which代替，一般介词一并前置做关联词组，in which 也可用where替换

英语翻译如题：the significance of changes in the structure is decre 英语意思：numbers in which the sum of its digits is a perfect squ in the prison与in prison的区别 Which of the following numbers if expressed in decimal form, Memory is a bridge which only leads to the prison of lonelin how is the weather in Canada The _________ is very famous in Canada. The _ tree is in Canada. Which country is ____(大)in population,the U.S.or Canada. Next key in the numbers the changes in there numbers which table is in the