合成琥珀

例句：

1. 1. The synthetic amber is a rare and valuable material.
   这种合成琥珀是一种稀有且珍贵的材料。
2. 2. The ancient civilizations used to trade synthetic amber for beads.
   古代文明曾用合成琥珀来交换珠子。
3. 3. The synthetic amber has been found in many places around the world.
   合成琥珀在全球范围内的许多地方都有发现。