名词
中文翻译：前奏
同义词：
['forerunner', 'foreshadow', "precursor例句：1. The preon of the new moon was a harbinger of spring.（新月的前奏预示着春天的到来。）2. The scientist's discovery was a precursor to future advancements in technology.（科学家的发现是未来技术进步的先兆。）"]
例句：
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1. The preon of the new moon was a harbinger of spring.
新月的前奏预示着春天的到来。
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2. The scientist's discovery was a precursor to future advancements in technology.
科学家的发现是未来技术进步的先兆。
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3.The music had a preon that suggested it would be upbeat.
这首音乐有一个预示，表明它将会欢快。