northern continent造句

• The world assumes a modern configuration 20 million years ago , antarctica was coverd by ice and the northern continents were cooling rapidly
  5千万至5千5百万年前，印度开始撞击亚洲，形成了青藏高原和喜马拉雅山脉。
• When this precessional wobble brings the northern continents nearest the sun during the summertime , the atmosphere gets a notable boost of methane from its primary natural source ? the decomposition of plant matter in wetlands
  当岁差的晃动让北半球陆地在夏季与太阳距离最近时，大气中的甲烷会明显上升；而自然界中甲烷的主要来自于湿地植物的分解作用。