constant sheaf的用法和样例：
例句
- The strain layer is composed of a high dielectric constant material.
应变层是由一个高介电常数的材质所构成。 - Based on the properties of BARC and low dielectric constant, the process reliability of these materials can be ensured and the process competence can be promoted.
由于此抗反射材料本身是由低介电常数材料所构成，因此在微影制程中可省去再外加抗反层的步骤，并增加制程的可靠度及竞争性。
