Tin is an elementary substance.
锡是一种元素物质。
Secondly, the enthalpy of elementary substance under standard state is defined as the criterion of component enthalpy, thus reaction heat is no longer needed in energy balance.
其次，热量衡算时，将标准状态下单质的焓定义为所有组分的基准焓，不再需要反应热数据。
The skills are the most elementary and important instrument which re-create the charm of vocal music which existed in the form of substance.
声乐技能是使物质形态和观念上的声乐艺术作品得以再创造、再现其艺术魅力的最基本、最重要的手段。
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