一个满满的杯子，须端好。
复合材料低的比例极限可由晶须端部应力集中所导致的低应力局部塑性变形来解释。
The low proportional limit may be explained by localized plastic deformation under low macroscopic stress caused by stress concentrations at the ends of SiC whiskers.
用铝合金管材制作散热器须进行扩口加工，其间往往会因为管材端部出现裂口而报废。
When we use the aluminium alloy pipe to make heat exchanger, we must use expanding. During that process the pipes usually become useless because of the end crack.
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