Crushing functions of a rotary crusher are achieved by its crushing cavity consisting of an eccentric rotary roller arid a fixed notch crushing plate.

回转式破碎机的破碎功能是通过偏心回转辊和固定凹面破碎板组成的破碎腔来实现的。

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The researchers say the toolmakers at Jebel Faya may have reached the Arabian Peninsula at a time when changes in the climate were transforming it from arid desert into a grassland habitat with lakes and rivers.

BBC: Humans 'left Africa much earlier'

It's a smattering of small wood and mud huts, about an hour's drive from Tete in a harsh arid environment.

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Semi-arid California would seem a logical place to regulate water efficiency.

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