Valve shall feature modular check assemblies with center stem guiding.
这种阀门应该配置模块化止回阀总成，其阀杆为中心引导。
This invention discloses a sewing machine having stem to be driven to perform longitudinal movement; wherein the stem can be fixed with sewing needle for guiding threads.
本发明涉及一种缝纫机，该缝纫机具有可驱动以上下运动的针杆，该针杆上可固定缝纫针以用于引导针线。
Tissue microenvironment plays a critical role in guiding local stem cell differentiation.
组织微环境在局部干细胞的分化过程中扮演了至关重要的角色。
Tissue microenvironment plays a critical role in guiding local stem cell differentiation.
组织微环境在局部干细胞的分化过程中扮演了至关重要的角色。
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