受保护的空格用于防止在某些位置换行。例如：
I have watched a movie which consisted of exactly 1.2
million images.
阅读起来比
I have watched a movie which consisted of exactly
1.2 million images.
因此人们使用1.2~million或1.2~million~images。
现在我的问题是，是否有一个很好的规则来应用受保护的空白。
例如，在以下情况下我是否应该使用受保护的空白？我应该使用不同的方法吗？
(1) This leads to a runtime of almost 2 minutes with our hardware.
(2) ... shows the output when using a stride of 37.
(3) a stride between 37 and 47 is sufficient.