1. The soil in this area is rich in alkali, making it difficult for plants to grow. 这个地区的土壤富含碱性物质，使得植物很难生长。

2. It is important to test the pH level of the water to ensure it is not too alkaline. 测试水的pH值很重要，以确保它不过于碱性。

3. Alkali substances can be harmful if not handled properly. 如果不正确处理，碱性物质可能会有害。

4. The cleaning solution contains a small amount of alkali to help break down grease and grime. 这种清洁溶液含有少量碱性物质，有助于分解油脂和污垢。

5. Some plants prefer slightly alkaline soil for optimal growth. 一些植物喜欢略微碱性的土壤以实现最佳生长。

6. Alkali metals are highly reactive and must be stored in oil to prevent them from reacting with air. 碱金属具有高度反应性，必须储存在油中以防止它们与空气发生反应。