Play great positioning pin ensures disc not because butterfly plate gravity drop, also can be installed in the valve stem end adjustment block to ensure that the butterfly plate fixed position.
弹赞定位销可保证蝶板不会因为蝶板重力作用下坠，还可在下阀杆端部设置调整块来保证蝶板位置固定。
Many people pin great hopes on such stem cells, which can transform into any cell type, as a potential source of therapies or cures for debilitating diseases.
许多人都对此干细胞寄予厚望，因为胚胎干细胞能转化为任何一种类型细胞。可以作为虚弱疾病很有潜力的治疗方法。
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