one's的意思：某人的；一个人的。one's是one的名词所有格形式。at(one's)will随意、It's one's field这是某人的本行、take one at one's word照对方说的做、put one's pride in one's pocket放下架子，谦虚，屈尊，忍辱含垢。
one's例句
One's feelings and instincts are not always a guide to behaviour.
一个人的感情和本能并不总是言行的良好向导。
Turning one's life into a waiting game requires faith and hope,and is strictly for the optimists among us ．
把一个人的生活变成一个等待的游戏需要信念和希望，只有我们之中的乐观者才做得到。
Up to a third of one's life is now being spent in retirement.
现在人们一生中能有三分之一的时间过退休生活。
Which one's your favourite?
你最喜欢哪一个？
My private affairs are no one's business but my own.
我自己的事自己管，不用其他人操心。