synthetic camphor

例句：

1. 1.The synthetic camphor is effective in killing mosquitoes.
   这种合成樟脑对杀灭蚊子非常有效。
2. 2. In winter, the synthetic camphor is used to keep the house warm.
   冬天，人们使用合成樟脑来保持房屋温暖。
3. 3. The synthetic camphor is a popular choice for scented candles.
   合成樟脑是香蜡烛受欢迎的选择。