Valve structure that is buried, extended stem structure, making it suitable for laying of underground pipes installed in places.

球阀埋地结构即，加长阀杆结构，使其适用于管线埋地铺设安装的场所。

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Large families began to divide into smaller extended families and stem families, with the trend pointing toward the emergence of more and more nuclear families.

人口众多的大家庭开始分成较小的家庭和直系家庭，总的趋势是出现了越来越多的核心家庭。

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Large families began to divide into smaller extended families and stem families, with the trend pointing toward the emergence of more and more nuclear families.

人口众多的大家庭开始分成较小的家庭和直系家庭，总的趋势是出现了越来越多的核心家庭。

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