In fact, most objects you see in a concert hall or theater serve double duty.

事实上，你在音乐厅或剧院看到的大多数物品都有双重功能。

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Objects are a double-edged sword.

对象是把双刃剑。

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Fixed: Made sign alphabet objects double sided.

修正：使符号字母对象双面。

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Fixed: Made sign alphabet objects double sided.

修正：使符号字母对象双面。

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