It has a negative end and a positive end and it has certain properties.
这是一个偶极，有正电端也有负电端，偶极具有一定性质。
To this end, the standard defines several properties in the keep and break category.
为此，标准在keep和break类别中定义了几种特性。
The weld mechanical properties of the joint at the end of the weld were...
研究了收弧坑的接头性能，其抗拉强度和伸长率均不低于中间焊缝。
The weld mechanical properties of the joint at the end of the weld were...
研究了收弧坑的接头性能，其抗拉强度和伸长率均不低于中间焊缝。
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