因此，你听到一个声音是因为其他人正在说些什么。
So if you hear a sound it is because someone was saying something.
令他惊讶的是，他听到了一个甜美的声音，“我就是那只天鹅。如果你想抓住我，你必须到仙境来。”
To his surprise, he heard a sweet voice, "I am the swan. If you want to catch me, you must come to the wonderland."
但是如果你已经成为一个领域的专家，您可能会开始听到一个很小的声音说，怪了！
But as you become expert in a field, you'll start to hear little voices saying, What a hack!
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