dielectric substance

例句：

1. 1. The insulator is made of glass and is used to prevent electricity from flowing through it.
   这个绝缘体是由玻璃制成的，用来防止电流通过。
2. 2.The dielectric material has a high dielectric constant, which means it can store a large amount of charge.
   这种介电材料具有很高的介电常数，意味着它可以存储大量的电荷。
3. 3. The dielectric properties of the material are important for its use in electronic devices.
   这种材料的介电性质对于其在电子设备中的应用非常重要。