为了强调行为在言论中的分量，美国最高法院在象征性表达中分离出了另～个概念：“言论附加”（speech plus）。
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speech plus simplex 语音加单工
speech plus telegraph circuit 话路插报电路
speech plus
演讲+
以上为机器翻译结果，长、整句建议使用 人工翻译 。
I think that is in a large part due to the quality of the speech synthesizer, which is made by speech Plus.
我想大部分原因是声音合成器的质量很好，是由Speech Plus生产的。
youdao
Plus, they often include text-to-speech technology that can read books or articles aloud -- maybe not with thrilling delivery, but still a useful option.
CNN: E-books spur reading among Americans, survey shows
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