Magnetic coils focus the electron beams into fine spots.

磁线圈将电子束聚焦成细小的点。

《柯林斯英汉双解大词典》

Astronomers might want to focus more on older, less active stars or search for planets with their own magnetic fields, she says.

天文学家可能想更多地关注更古老的、又不太活跃的星体或者寻找拥有它们自己磁场的行星，她说。

youdao

You will see that I focus on magnetic and biomagnetic fields.

你会看到我在磁场和生物磁场方面的重点。

youdao

You've got a magnetic field, maybe even magnetic susceptibility, the electric field. We're not going to worry about these magnetic fields or electric fields in this class So, pretty much we're going to focus on this set of variables here.

你也会引入磁场，或许甚至磁化率，以及电场，我们这堂课不需要关心,这些磁场或,电场之类的东西,基本上我们只关注,这里的一组变量。

麻省理工公开课 - 热力学与动力学课程节选

They will focus on the places above the poles where the wind pierces the earth's magnetic defences and causes, among other things, the shimmering lights of the aurora borealis and aurora australis, and interference with radio communications.

ECONOMIST: Birds of a feather