柯林斯詞典alkali /??lk??la?/ (alkalis) 1. N-MASS An alkali is a substance with a pH value of more than 7. Alkalis form chemical salts when they are combined with acids. 堿 返回 alkali劍橋詞典a substance that has the opposite effect or chemical behaviour to an acid 堿；強(qiáng)堿 返回 alkali