heater drain valve hole

例句：

1. 1.The heater drain valve hole is crucial for ensuring the proper functioning of the heating system.
   加热器排水阀孔对于确保加热系统正常工作至关重要。
2. 2. The technician carefully inspected the heater drain valve hole to identify any potential issues.
   技术人员仔细检查了加热器排水阀孔，以识别任何潜在问题。
3. 3.The heater drain valve hole was designed to allow air to flow freely, preventing any buildup of moisture inside the heating system.
   加热器排水阀孔设计为允许空气自由流动，防止加热系统中水分的积累。