Trading was important, as so many raw materials, the semiprecious stones for the decoration of the temples, timbers for roofs, and allmetals, had to be imported.
由于大量原材料，如用于装饰庙宇的半宝石石料、建造屋顶的木材和所有金属都需要进口，贸易变得至关重要。
3
Like allmetals, these react with other elements by giving up electrons to form positively charged ions.