When an one-point or multi-point earth fault occurs, the monitor can quickly detect the serial number and polarity of the branch circuit earthed, and meantime give alarm to the operator on site.

在直流系统发生一点或多点接地时，该装置能迅速检查发生接地的直流支路编号及接地支路的极性，同时报警提示现场运行人员。

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Unlike the simple polarity in epithelial cells, hepatocytes are constituted of multi-polar membranes between blood vessels and bile ducts, and separated by tight junctions.

与简单极化上皮细胞不同，肝细胞在肝脏血管与胆小管间形成多个极化膜面，并由紧密连接分隔。

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We want to contribute to a benign multi-polarity that is founded on dynamics of free cooperation, free of the asymmetries of the past that generate crisis and instabilities.

WHITEHOUSE: President Obama, President Rousseff Meet in Brasilia