The fractures of the alloys change from dimple to cleavage fracture with river pattern.

合金的断口形貌由韧窝向河流花纹状的解理形貌转变。

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There always some nodes exist in natural river channels and the capability of river pattern control of nodes is limited.

在天然河道中常存在一些节点，节点对河势的控制能力是有限的。

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Stream gradient and bed sand constituent are the main factors which is influencing on river pattern formation in the boundary condition.

河道比降、床沙组成是河道边界条件中影响河型形成的最主要因素。

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The exception to this pattern is Anbar, an arid expanse bordering Syria and watered by the Euphrates river, where many towns are mainly in insurgent hands, despite periodic American assaults.

ECONOMIST: Iraq's constitution

"We all admire the beaver for the way it can turn a linear river into a lake with a dam, but the termites turning the desert into a pattern of oases that allow permanent life even in drought periods for hundreds of years - that's much more fascinating, " he told BBC News.

BBC: Termites 'engineer fairy circles'