1. Chinese Pinyin: jiǎn, the negative ions generated during the ionization of the electrolyte are all compounds of hydroxide ions. It can neutralize with acid to form salt and water. The aqueous solution has an astringent taste and can turn litmus paper blue. Such as sodium hydroxide, potassium hydroxide, etc.

2. Alkalinity, alkalinity jiǎndù, jiǎnxìng, the degree of alkalinity of slag.

3. Alkaline soil jiǎntǔ, any type of hidden soil, which is dark and solid Saline-alkali soil shows a columnar structure and contains sulfates, bicarbonates and other soluble salts. They are caused by incomplete drainage on saline soils in semi-arid areas.