faintly alcaline reaction

例句：

1. 1.The faint alkaline reaction of the soil is a key factor in determining its fertility.
   土壤中的微弱碱性反应是决定其肥力的关键因素。
2. 2.In the study of organic chemistry, understanding the faint alkaline reaction can help us better understand the properties of organic compounds.
   在有机化学研究中，理解微弱的碱性反应可以帮助我们更好地了解有机化合物的性质。
3. 3. The faint alkaline reaction was observed when the sample was exposed to air for a short time.
   当样品暴露于空气中短时间后，观察到了微弱的碱性反应。