Shi and Li's artificial polymer tubules have a diameter of around 50 microns - about half the width of a human hair.
Shi和Li的人造聚合物管直径大约50微米——大约为人类毛发的一半宽度。
This fact does not contact the shaft seal surface, it is the sealing principle of polymer cooled to half molten state and forming the seal.
这种密封实际上并不接触轴的表面，它的密封原理是将聚合物冷却到半熔融状态而形成自密封。
The half-metallocene of the elements V, Nb and Ta in VB group could be used in the polymerization of olefin to prepare polymer with rather narrow molecular weight distribution (1.05).
VB族元素钒、铌、钽的单茂金属化合物作为烯烃催化剂可得到分子量分布相当窄（1.05）的聚烯烃；
The half-metallocene of the elements V, Nb and Ta in VB group could be used in the polymerization of olefin to prepare polymer with rather narrow molecular weight distribution (1.05).
VB族元素钒、铌、钽的单茂金属化合物作为烯烃催化剂可得到分子量分布相当窄（1.05）的聚烯烃；
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