另一方面，西非内陆的降雨量增加，采采蝇活动区域的北部边界向南移动——一种对牛致命的昆虫。
On the other hand, rainfall increased in the interior of western Africa, and the northern limit of the tsetse fly, an insect fatal to cattle, moved south.
位于北部边界和靠近墨西哥城的公司安全感最少。
Companies based in the northern border region, and near Mexico City, felt least safe.
三十年前，越南士兵在北部边界附近的谅山展开最后的激战以击退敌军。
Thirty years ago, Vietnamese soldiers waged a final, furious battle in the hills of Lang Son near the country's northern border to push back enemy troops.
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