meridional focal line

例句：

1. 1. The meridional focal line is a crucial feature in the study of climate change.
   中纬度焦点线是研究气候变化的关键特征。
2. 2. The meridional focal line runs through the center of the continent, marking the boundary between two differentclimate zones.
   中纬度焦点线贯穿大陆中心，标志着两个不同气候带的分界。
3. 3. The meridional focal line plays a significant role in determining the distribution of plant species along the equator.
   中纬度焦点线在确定热带地区植物物种分布方面起着重要作用。