No one ( )得知this top secret为什么可填is accessible to?

这是一个短语,be accessible to 与……接近
句子意思是,没有人可以接近到这个最高机密.
举几个例子：
All that is accessible to man is the relation of the life of the bee to other manifestations of life.
人类所能领会的,只是蜜蜂的生活与别种生活现象的关系.
Because subatomic physics reaches into so many areas,should not only be accessible to physicists,but also to other scientists.
由于亚原子物理学涉及如此广泛的领域,所以不仅物理学家,而且其他科学家都应了解它.
The selected file is not part of the form,which means it might not be accessible from other computers.Do you want to add this file to your form so that it will be accessible from other computers?
所选的文件不是表单的一部分,这意味着可能无法从其他计算机访问该文件.是否要将此文件添加到表单以便可以从其他计算机访问该文件?
'{0}' is not accessible from this scope
无法从此范围访问“{0}”