in the possession of 

英汉解释

被某人占有；属于…；为…所有

参考例句

1. It is pity so many useful discoveries should be in the possession of a silent man.
那么多有用的见解，却埋藏在一个不爱说话的人的肚子里，实在可惜。
2. This one must have been in the possession of a private collector and somehow managed to escape.
这只美洲狮一定是某位个人收藏家驯养的，不知怎么设法逃出来了。
3. As no pumas had been reported missing from any zoo in the country, this one must have been in the possession of a private collector and somehow managed to escape.
由于全国动物园没有一家报告丢了美洲狮， 因此那只美洲狮一定是某位私人收藏家豢养的， 不知怎么设法逃出来了。

网络释义

in the possession of
被（为了）……占有（所用）（表示被动）; 属于; 属于……; 为…所拥有;
are in the possession of
为...所占有; 掌握在...手里;
am in the possession of
为...所占有; 掌握在...手里;
was in the possession of
为...所占有; 掌握在...手里;
is in the possession of
为...所占有; 掌握在...手里;