Discussing several ordinary processing technologies of valve seat ring and valve stem guide hole of cylinder head now.
对目前气缸盖气门座圈和导管孔的几种一般加工工艺进行讨论。
Analyzing the many factors of affecting the processing precision of valve seat ring and valve stem guide hole of cylinder head.
对影响气缸盖气门座圈和气门导管孔的加工精度的诸多因素进行分析。
Last year a group at the University of Minnesota found a way to guide human embryonic stem cells into becoming a potent type of white blood cell which destroys tumour cells.
去年，明尼苏达大学的一个科研小组找出了一种可以引导人类胚胎干细胞，使其转化成强有力白细胞类型的方法，从而破坏肿瘤细胞。
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