Many drive for hours, eager to glimpse the rarity before the cold fronts of autumn carry it back south.
有许多人驱车数小时，就是渴望在寒意乍来的初秋让鸟们回到南方之前能够一瞥这些稀有鸟类。
My advice to them at this point is to keep up the good work and then pray to the Mongolian Weather Gods to send cold fronts. That's their best hope for clean air.
我在这点上给他们的建议是保持良好的工作然后祈祷蒙古天神送来冷气流。这是他们对清洁空气的最好的祝福。
The sky may clear very abruptly, even before the passage of the surface cold front in some cases, although with kata-cold fronts the changes are altogether more gradual. 3.
天空会突然放晴，有些情况下，甚至在地面冷锋过境前就放晴了，虽然下滑锋的变化总的来说要缓和得多。
The cold front the weather conditions observed at cold fronts are equally variable, depending upon the stability of the warm sector air and the vertical motion relative to the frontal zone.
冷锋冷锋的天气状况同样是多变的，它依赖于暖区气团的稳定性和相对于锋区的垂直运动。
The cold front the weather conditions observed at cold fronts are equally variable, depending upon the stability of the warm sector air and the vertical motion relative to the frontal zone.
冷锋冷锋的天气状况同样是多变的，它依赖于暖区气团的稳定性和相对于锋区的垂直运动。
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