磁线圈将电子束聚焦成细小的点。

Magnetic coils focus the electron beams into fine spots.

《柯林斯英汉双解大词典》

他们使用了经颅磁刺激(TMS)技术，用紧密聚焦的磁场来使大脑的局部地区暂时失去功能。

They achieved this using transcranial magnetic stimulation (TMS), a technology that USES a tightly focused magnetic field to temporarily disable individual regions of the brain.

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分析了磁光盘驱动器聚焦与循轨数字伺服系统各组成部分的原理，并设计和实现了一套基于DSP的数字伺服控制系统。

The paper analyzes the principle of components of magneto optical disk driver focusing and tracking servo system, then designs and realizes a DSP based digital servo control system.

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