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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They have meaningfully extended the season and helped stem the defection of talent to the European and other world tours.

WSJ: Tim Finchem on the State of Golf in 2012 | Golf Journal by John Paul Newport

The malaise has extended to companies working with less ethically questionable adult stem cells, which, unlike embryonic stem cells, don't require the destruction of embryos.

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