They usually operated in bands between ten and twenty strong and relied for survival on difficult terrain and bad transport.

他们通常以10到20人的队伍作战，很坚强，依靠艰难的地形和糟糕的交通条件生存下来。

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However, unlike the semiconductor silicon, graphene has no gap between its valence and conduction bands.

然而，与半导体硅不同，石墨烯的价带和导带之间没有带隙。

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Recognition of relatives promoted cooperation between neighboring bands, in his view, allowing people to move freely from one to another.

在他看来，对亲属的识别促进了相邻组合间的合作，使得人们可以在组合之间自由变化。

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Palmer says that leads to regular screaming matches between bands and venue managers.

NPR: Band Tries to Make It Big Without Going Broke

The technology uses gaps in radio spectrum, called 'white spaces', which exist in between frequency bands.

ENGADGET: UK regulator wants white space wireless service in 2014, starts trials this fall

There was no difference between the bands, but there was a marked improvement in tests which were being done by an athlete for the second time.

BBC: What are Power Balance bands?