非间断空格(nbsp)并非HTML中可用的唯一一种空格字符。全角空格(em space)和字体等宽，能够形成一个完美的方形分隔符。半角空格(en space)的宽度是它的1/2。
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four-em space 四分之一全身间隔
four-to-em space 全身四分之一间隔
three-to-em space 全身三分之一空铅
five-to-em space 全身五分之一间隔
SIX-PER-EM SPACE 六分之一的EM间隔
FOUR-PER-EM SPACE 四分之一的EM间隔
THREE-PER-EM SPACE 三分之一的EM间隔
The boundary between the two areas acts as a wall, capable of reflecting a guided EM wave on the graphene much like one would in a three dimensional space.
两个区域的边界就像是一堵墙，能反射被引导的电磁波； 这和三维空间中的墙是类似的。
To simulate transmission conditions of EM wave in free space, the biomedical microwave anechoic chamber used for biomedical engineering research was developed.
为模拟电磁波在自由空间的传输状态，研制了用于生物医学工程研究的大型专用微波暗室。
By monitoring of intensity of EM radiation for TV Broadcasting in Jinan city this paper proposed a evaluation conclusion and a distributive law of space and time.
通过对济南市电视广播电磁辐射强度进行监测，提出相应的评价结果和空间与时间分布规律，为济南市城市规划和电视广播电磁辐射监管提供技术支。
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