bipolar distribution

The bipolar distribution and biogeography of the Ordovician faunas

奥陶纪生物的两极分布及其与生物地理的关系

With international economic situation becomes well gradually, inbound tourism resumes quickly and outbound tourism increases notably; domestic tourism also increase but bipolar distribution situation aggravate.

其中，随着国际经济形势的逐渐好转，入境游迅速恢复和出境游增长显著；国内旅游人数和收入虽有所增长但两极分化的局面继续扩大。

When the motion of the flux tube is oblique direction, most passage positions appear irregular FTEs, and the signatures of Bz is bipolar distribution.

当通量管在x方向有正或负速度分量即斜向运动时，大部分部位测到的B x呈不规则变化，B z表现为双极分布。

Place of origin for these genera which belong to bipolar distribution may be the mixed livingarea ( or zone) between two realms.

认为古生物地理大区的混生区是这些两极分布的凉水型分子的起源地，即混生区起源。