它为您节省了保存数据副本所需的额外空间。

That saves you having to allocate additional storage to hold a copy of your data.

youdao

值得指出的是，在原始安装中有大量的额外空间。

It is worth noting that in the initial install, there's a very large amount of extra space.

youdao

每个内嵌的对象需要8个字节的额外空间。

Each embedded object incurs 8 bytes overhead.

youdao

And as a consequence, access time in the list is constant, which is what I want.

这会占用一些额外的空间，回到问题本身，这么做的话，读取数组的时间就变成常量了。

麻省理工公开课 - 计算机科学及编程导论课程节选

It's which partials are particularly prominent, have extra punch or extra volume to them.

答案是有几个特别突出的泛音,为它们提供了额外的冲击力和空间

耶鲁公开课 - 聆听音乐课程节选