无法看到选择神经引擎的选项。

【以下的问题经过翻译处理】 我是Polly的新手，正在尝试使用它为搞笑视频创建新闻播报的语音。我在俄亥俄州地区。我选择了Mathew的声音，并从Amazon Polly的资源页面中复制粘贴了新闻播报风格的脚本到SSML框中。但是我收到了报错：“The input text contains invalid SSML syntax. Fix the SSML syntax, and then try again”。我意识到它仅适用于神经语音。然而，在我的终端上我并没有看到选择神经引擎的选项。我使用的代码和资源页面上的完全一样（如下所示） 以下代码是从开发人员指南中复制粘贴的： <speak> <amazon:domain name="news"> From the Tuesday, April 16th, 1912 edition of The Guardian newspaper:

The maiden voyage of the White Star liner Titanic, the largest ship ever launched, has ended in disaster.

The Titanic started her trip from Southampton for New York on Wednesday. Late on Sunday night she struck an iceberg off the Grand Banks of Newfoundland. By wireless telegraphy she sent out signals of distress, and several liners were near enough to catch and respond to the call. </amazon:domain> </speak>