请问在下面一句英语里，to do just that 是什么意思？

请问在下面一句英语里，to do just that 是什么意思？

如果这样：Zuckerberg and his wife, Priscilla Chan， would donate 99% of his Facebook stock shares to plug his work.
扎克伯格及其爱妻将捐赠99%的脸书股票,为了扬名立万。
很好理解吧？那为什么换成to do just that就不知道啦？
to do just that表示强调，“仅仅为某事而做某事”暗含“没有其他意图或目的”可以理解为目的状语：
Zuckerberg and his wife, Priscilla Chan， would donate 99% of his Facebook stock shares to do just that.
扎克伯格及其爱妻将捐赠99%的脸书股票， 仅仅为了捐赠而捐赠。

这样做。。。

to do just that.只做