1 ADJ [ADJ n] 一对一的；仅限两人之间的 In a one-to-one relationship, one person deals directly with only one other person. 一对一的；仅限两人之间的
SYN individual, private, personal, exclusive
One-to-one is also an adverb.
2 ADJ [ADJ n] 对应的；对等的 If there is a one-to-one match between two sets of things, each member of one set matches a member of the other set. 对应的；对等的
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In English, there is not a consistent one-to-one match between each written symbol and each distinct spoken sound.
英语中，每个书写符号和每个独特发音之间没有固定的一一对应关系。