The 12 volunteers tested in the experiment were played words created through a speechsynthesizer which were purposely difficult to understand.
参加试验的12名志愿者收听了通过语音合成器产生的特别难懂的单词。
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Screen readers allow users to interact with a GUI by creating an off-screen representation of the interface and passing this to a speechsynthesizer or a Braille terminal.