He indicated a semicircle with a radius of about thirty miles.

他标示出一个半径大约三十英里的半圆。

《柯林斯英汉双解大词典》

youdao

They are the radius of the orbit, the energy of the system and the velocity of the electron, and I am just going to present you the solutions.

它们是轨道的半径，系统的能量以及电子的速度，我接下来给你们展示解法。

youdao

Because what it tells is that we can figure out exactly what the radius of an electron and a nucleus are in a hydrogen atom.

我们可以,准确的算出,氢原子中,电子。

麻省理工公开课 - 化学原理课程节选

The radius of the orbit, the energy of the system and the velocity of the electron, I am just going to present you the solutions.

是轨道的半径，系统的能量,以及电子的速度，我接下来会给你们讲解其方程的解法。

麻省理工公开课 - 固态化学导论课程节选

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

But all of these tap rooms await within a 2-mile radius of each other.

FORBES: An Open Letter To Frommer's From The 'Napa Valley of Beer'

The cull is to affect sheep on farms in the three-kilometre radius of the outbreak at Meigh.

BBC: Farm in Thisk in Northern Ireland

In total, 839 people were evacuated as police cleared an area within a 300-yard radius of the bomb.

CNN: Experts defuse unexploded WWII bomb in central Berlin