The aerator only made of three major parts of pottery aerator aerate screw and cap is simple in structure and of easy assembly. there is a very small sealed area.

结构简单、组装方便。整个曝气器仅由陶瓷曝气头、通气螺杆、螺帽三个主要部分组成，密封部位面积极小。

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The aerator, only made of three major parts of pottery aerator, aerate screw and cap is simple in structure and of easy assembly. There is a very small sealed area.

整个曝气器仅由陶瓷曝气头、通气螺杆、螺帽三个主要部分组成，密封部位面积极小。

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Airtight structure is a very important facility in coal mines. It is of great significance to learn changes in parameters at sealed area timely and accurately for safety in production.

密闭是煤矿井下一道非常重要的设施，及时准确地掌握密闭内各参数的变化对安全生产有着重要的意义。

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Firefighters had to break their way into a sealed roof area to tackle the blaze.

BBC: Catherine Junior School in Leicester closed after fire

Within minutes, widening lines of police officers sealed off the area by forcing back bystanders and journalists.

CNN: Past bombings prepared response in Boston

Police sealed off the area, saying they expected to spend the night outside the mosque to ensure that demonstrators did not return.

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