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Fixed: Made sign alphabet objects double sided.
修正：使符号字母对象双面。
youdao
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The base has special concave design, and can be fixed with double-sided tape.
底板有特殊凹位设计，可以直接用双面胶固定。
youdao
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The base has special concave design, and can be fixed with double-sided tape.
底板有特殊凹位设计，可以直接用双面胶固定。
youdao