届时如果火山灰云飘向另一个方向，飞机可能会被指示绕开或在其上方飞行。
If the ash cloud were to drift in another direction, flights could be sent around or above it.
这团痕迹可能是飞机或火箭飞上高空后留下的航迹云。
A contrail is the visible vapor trail behind airplanes or rockets traveling at high altitudes.
白色的痕迹疑似飞机留下的凝结尾迹或飞行云，但它们实际由轮船留下。
The white trails look vaguely like the condensation trails, or contrails, left behind by airplanes, but they actually result from ship exhaust.
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