名词
中文翻译：化学钟
同义词：
['chemical timer', 'chemical time scale']
例句：
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1.The chemical clock is used to measure the amount of time that has passed since a certain event.
化学钟用于测量自某一事件发生以来经过的时间。
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2. The chemical clock is crucial for understanding the evolution of life on Earth.
化学钟对于理解地球上生命演化至关重要。
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3.The chemical clock is used in many fields, including medicine and agriculture.
化学钟在许多领域都有应用，如医学和农业。