The cold-heat cycle underground is closely related to the hydrogeological characteristics of various rock and soil stratum (aquifer) when groundwater source heat pump system is running.

地下水源热泵系统运行期间，地下冷热量循环过程与地下不同岩土层（含水层）的水文地质特征密切相关。

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The first spreading cycle resulted in the formation of Wenchang mudstone, Eocene, which is the important and main source rock of the basin.

第一扩张旋回中形成的始新统文昌组泥岩是珠江口盆地的主要烃源岩。

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The big differences exist for the influence of different aqueous solution, different rocks, different immersion ways and different velocity of cycle flow on the fracture mechanics effects of rock.

不同岩性、不同浸泡方式及不同水溶液流动速率对岩石断裂力学指标的影响存在着较大差异。

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Bike around the edge or cycle into the crater on Route 40, passing the Carpentry, a unique rock formation that resembles wood.

BBC: Israel's mysterious ��Grand Canyon��

It was sheer good fortune, he always thought, that brought both Mr Rock and Mr Perkins into his life, and the luck of the business cycle that put him in the thick of the wildest industrial growth in modern American history.

ECONOMIST: Eugene Kleiner