From the outside of the seal of the pollutants permanent embedded seal on the blade surface and cause shaft sealing lip premature wear of margin;

污染物从密封的里外面永久性的嵌入密封刃口上造成轴表面和密封唇缘的过早磨损；

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The utility model is compact in structure and beautiful in appearance with the dust-proof sealing ring which is capable of effectively preventing outside dust coming into the cylinder.

本实用新型结构紧凑、外形美观，并 带有防尘密封环，可有效防止外界灰尘进入气缸。

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According to the factors of operation pressure, medium and temperature, the specification and outside dimension of hollow metal O-ring, the detailed dimension of sealing groove were determined.

设计时应根据操作压力、介质和温度等条件确定金属空心o形圈的外形尺寸和规格，然后进行矩形槽的设计。

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In order to help protect close relatives, termites have been found to explode during fights, bees die after stinging, while the members of another species of ant have been found to condemn themselves to death by sealing in a nesting colony from the outside.

BBC: Earth News - Heroic altruistic ants face death alone to save colony