名词
中文翻译：先兆
同义词：
['forerunner', 'forerunner', 'precursor']
例句：
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1.The discovery of the new drug was a precursor to its eventual approval.
新药的发现是其最终获批的前奏。
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2.The research on this topic is a precursor to understanding the underlying mechanisms.
对这个话题的研究是理解其根本机制的前奏。
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3.The development of the new technology was a precursor to the industrial revolution.
新技术的开发是工业革命的前奏。