alkali-earth metal

例句：

1. 1. The soil is rich in alkaline earth metals, which are essential for plant growth.
   土壤富含碱土金属，对植物生长至关重要。
2. 2.The discovery of this new mineral has opened up new possibilities for the production of steel.
   这种新矿物的发现为钢铁生产开辟了新的可能性。
3. 3.The alkaline earth metals play a crucial role in the chemical industry.
   碱土金属在化学工业中起着至关重要的作用。