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。

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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。

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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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