Another is that the number of humans who venture into polar bear territory remains somewhat low.

另一个理由则是，冒险进入北极熊领地的人还是少之又少的。

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The 12 of low polar components of Anabasis Aphylla L. were separated and identified by gas chromatography-mass spectrometry. They are naphthalene and azulene species.

采用气相色谱-质谱测定无叶假木贼低极性化学成分，分离鉴定了12个化合物，它们是萘类与类化合物。

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If the silane has no polar group, the surface free energy is low.

反之若硅烷中不含有极性基，则处理后玻纤的表面能较低。

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Some companies with low innovation reputation, the polar opposite of Apple, tend to outperform the market.

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The reason for the excitement is that, although the existence of ice on Mars has been known since 1666, when the planet's polar caps were first seen, the low temperatures and air pressure there mean that water, even if heavily salted, is likely either to freeze or to evaporate.

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Polar bears are a long-lived species with a low reproductive rate, so recovery from overharvesting could take many decades.

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