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Subscription to extra features (such as sound) is an option for users.
用户可以选择，是否要添加额外功能（例如声音）。
youdao
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Added option to signal successful gestures using sound.
由选择成功的手势信号采用无害。
youdao
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Added option to signal successful gestures using sound.
由选择成功的手势信号采用无害。
youdao