Each group could again be divided into left and right ventricular type by the anatomical feature of the primary chamber.

根据主室腔的解剖特征，每类又分为左室和右室两型。

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According to the morphological characters of primary chamber, each group could be also divided into left and right ventricular type.

根据主室腔的解剖特征，每类又分为左室和右室两型。

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The screening technology is a primary way to insure high yield and super fineness of fine grinding mill. But it is mainly used in the obstructing equipment in the chamber of fine grinding mill.

采用磨内筛分技术是保证高细磨的高产量与高细度的主要技术措施，但主要使用在高细磨各粉磨仓的隔仓装置上。

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The air lock installation is the primary objective of the Atlantis mission, with the two-room chamber allowing space station crews to venture from the station in NASA spacesuits without the assistance of visiting shuttles.

CNN: Air lock installed on space station