colourlesssubstance

例句：

1. 1. The scientist discovered a new colourless substance that could be used in medicine.
   科学家发现了一种新的无色物质，可用于医学。
2. 2.The chemical analysis revealed the presence of a colourless substance in the sample.
   化学分析显示样本中存在一种无色物质。
3. 3. The research team found a colourless substance that could potentially be used as a substitute for plastic.
   研究小组发现了一种无色物质，可能用作塑料的替代品。