polar zone

同根派生

The two systems of government are polar opposites.
這兩種政體正好相反。
The results indicate that the B/M boundary appears at the top of L7 and that the Jaramillo normal polarity subzone of the Matuyama negative polarity zone appears in the lower part of the section.
結果表明，B/M界線出現在L7的底部，并且在剖面下部出現了松山負向期的賈拉米洛正向極性亞帶。
Most insect do not live in polar region.
大多數的昆蟲不在極地地區(qū)生存。
The Norwegians live in a comparatively cold zone.
挪威人生活在比較寒冷的地區(qū)。
Are there any animals in the polar circles?
南極圈和北極圈內有動物存在嗎？