on a need-to-know basis idiom
仅限于人们需要知道的东西
If you tell people something on a need-to-know basis, you only tell them the facts they need to know at the time they need to know them, and nothing more.
江苏热线英汉汉英双解词典包含207361条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。