x It says, take the name x and create a binding for that name to the value of the sub-expression and in fact to do this, to stress a point, let's do that.

它的意思是，创建了一个名字,然后创建了对于这个名字,和子表达式的值的绑定,实际上这么做，我们是为了，要强调一个点，让我们来说说这个点。

麻省理工公开课 - 计算机科学及编程导论课程节选

All right. So most of you got that, though there is this little sub-set we have thinking that we have one, so let's actually write this out here.

好，大部分人都答对了，虽然还,有些人没对，让我们把这个写下来。

麻省理工公开课 - 化学原理课程节选

ml=-2 So let's say we have n equals 4, and n sub l equalling negative 2.

这里n等于。

麻省理工公开课 - 化学原理课程节选