名词
中文翻译：初始物质
同义词：
['primitive substance', 'primary substance']
例句：
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1.The initial substance of the reaction is unknown.
反应的初始物质未知。
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2. The discovery of this substance has sparked a new wave of research.
这种物质的发现引发了新一轮的研究热潮。
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3.The chemical properties of this substance are still being studied.
这种物质的化学性质仍在研究中。