啤酒和洗发水都有极性分子，它们可以在气液分解面上积累，但是阻止气泡破掉的机制，对于肥皂沫和啤酒来说，有着根本上的区别。

Both beer and shampoo have polar molecules that accumulate at a liquid-gas interface, but the mechanisms that prevent bubble collapse in soap foams or pilsner heads are fundamentally different.

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本文以苯乙烯和丙烯酸酯的低分子共聚物为B段，以含有极性基团的单体为A段合成了A—B嵌段型颜料分散剂。

An A-B blocked pigment-dispersing agent has been synthesised , in which the A block is a monomer with polar groups and the B fo'oek is the oligomer of styrene and acrylate with lower molecular weight.

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在LLDPE的大分子上没有极性基团，它与很多基材如金属、塑料、玻璃和低的粘结力很差。

There is no polar radical on the macromolecules of LLDPE. It has poor adhesion to many substrates such as metal, plastics, glass and paper.

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We only have the one bond so the actual HF molecule is polar, it has a net dipole.

但HF中只有一根键,所以分子也是极性的而甲烷中有一个网状偶极。

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