磁线圈将电子束聚焦成细小的点。
4.N-COUNT Thefocus of something is the main topic or main thing that it is concerned with. 焦点
例:The UNs role in promoting peace is increasingly the focus of international attention.
联合国在促进和平方面的作用越来越成为国际关注的焦点。
例:The new system is the focus of controversy.
新系统是争议的焦点。
5.N-COUNT Your focus on something is the special attention that you pay it. 关注
例:He said his sudden focus on foreign policy was not motivated by presidential politics.
他说他突然关注外交政策并不是受总统政治的驱使。
6.N-UNCOUNT If you say that something has a focus, you mean that you can see a purpose in it. 诉求点
例:Somehow, though, their latest CD has a focus that the others have lacked.
但是,不管怎么说,他们的最新激光唱片具备别人没有的诉求点。
7.N-UNCOUNT You use focus to refer to the fact of adjusting your eyes or a camera, telescope, or other instrument, and to the degree to which you can see clearly. 焦点; 对焦
例:His focus switched to the little white ball.
他的焦点转移到了那个小白球上。
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