alkaloida opii

例句：

1. 1. The alkaline water is good for health.
   这种碱性水对健康有益。
2. 2. The alkaline earth metals are important in the chemical industry.
   碱土金属在化学工业中非常重要。
3. 3. The alkaline earth metals have a strong affinity for water.
   碱土金属对水有很强的亲和力。