one-to-one
adjective uk/ˌwʌn.təˈwʌn/ us/ˌwʌn.təˈwʌn/
(CONNECTION)
一一对应的；有关联影响的；水涨船高的
Something that is in a one-to-one relationship with another thing strongly influences the way that the other thing changes.
Is there a one-to-one relationship between pay levels and productivity? 工资水平和生产效率直接相关吗？
(SAME VALUE)
（价值）一比一的，相同的
used to describe something that has the same value as another thing
The dollar was linked to the peso at a one-to-one rate. 比索与美元是一比一挂钩的。
(TWO PEOPLE)
[ before noun ] UK (US one-on-one)一对一的;面对面的
A one-to-one activity involves two people talking directly, usually with one teaching or giving information to the other.
These children have special educational needs and require one-to-one attention. 这些孩子有特别的教育需求，需要给予一对一的关注。
one-to-one
adverb uk/ˌwʌn.təˈwʌn/ us/ˌwʌn.təˈwʌn/
UK (US one-on-one)（仅在两人之间的）一对一地
If two people discuss something one-to-one, they discuss it directly, without involving anyone else.
It's best to talk to him about the problem one-to-one. 最好是和他一对一地谈一些这些问题。
one-to-one
noun [ C ] uk/ˌwʌn.təˈwʌn/ us/ˌwʌn.təˈwʌn/ one-to-ones
UK (US one-on-one)（通常指一人教另一人或给予另一人信息）一对一的谈话（或活动）
a discussion or activity that involves two people talking directly, usually with one teaching or giving information to the other
I have regular one-to-ones with my manager. 我经常和我的经理单独开会。