sealcontact face的用法和样例：
例句
- Unlike any other design, the Bi-Directional Knife Gate Valve provides a combination face and perimeter seal.
与其它设计不同的是，双向刀闸阀结合了密封面与圆周密封的双重优点。 - The inner mechanical seal shall be constructed with a solid block carbon rotating seal face and a solid block silicon carbide stationary seal face.
内置的机械密封结构应该采用一块整体结晶碳旋转密封面和一块整体结晶碳化硅固定密封面。
