mothers often leave baby pandas for two whole days on their own
问题描述：
mothers often leave baby pandas for two whole days on their own
上面这句话可得出一词组 on one’s own 但是上句中为什么是their?而不是them呢?
答
them是they的宾格,their是代词,如果仍要用您所说的one's来解释的话就是they's(这么用虽然是不对滴).
p.s.don't hesitate to ask if you've got further problem~