这些声音可以让用户知道他离物体有多远。

The sounds make the user know how far he is from the object.

youdao

youdao

youdao

What I just spent many lectures discussing is the fact that we can not know how far away an electron is from the nucleus, so we can't actually know the radius of a certain atom.

我花了这么多课时所讨论的正是我们,不可能知道电子离原子核有多远这一事实，因此我们不可能知道某个原子的半径。

麻省理工公开课 - 化学原理课程节选

Because we know as we go to infinity, even though the density gets smaller and smaller and smaller, we still have electron density very far away from the nucleus.

因为我们知道即使到了无穷远处，尽管电子密度会变得非常非常非常小，但我们仍然有一定的电子密度，无论离原子核多远。

麻省理工公开课 - 化学原理课程节选

How far am I from camp?"

我离营地有多远"

耶鲁公开课 - 基础物理课程节选