为便于说明中文和西文字符的区别，先解释一下本文要用到的"半角字符"（half-width characters）和"全角字符"（full-width characters）的概念。
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For example, Japanese katakana characters can be written as full-width or half-width.
例如，日语片假名字符可以写为全角或半角形式。
Optical microcavity arouses great interest in condensed state physics. It can change characters of spontaneous emission, such as spectral full width at half-maximum, light intensity at peak and so on.
光学微腔是目前凝聚态物理的研究热点，它能够改变自发发射的特性（谱线宽度、发光强度等）。
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