This method has the characters of few limited conditions and application easily.
该方法具有限制条件少，应用灵活方便等特点。
Because the badge has limited space, it should have 4 characters or less.
由于标记的空间有限，它可以表示4个或更少的字符。
Because the badge has limited space, it should have 4 characters or less.
由于标记的空间有限，它可以表示4个或更少的字符。
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