hitherto

ad. 到目前为止,迄今

This is a fact hitherto unknown.

这是一个至今无人知道的事实。

In the execution of a computer program, to load a segment of the computer program in a storage area hitherto occupied by parts of the computer program that are not currently needed.

在计算机程序执行中，把一个计算机程序段装入在此以前被当前不需要的程序部分所占用的存储器区域中。参阅formoverlay。