Then updraft wind currents carry the light, positively charged ice crystals up to the top of the cloud.

然后上升气流将轻盈的、带正电荷的冰晶带到云的顶部。

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Changes in wind currents can then affect weather around the world.

气流的变化可以影响全球的天气。

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Though small individual craft, they were fast and not totally dependent on wind currents.

虽然个别小筏，他们速度快，不能完全依赖于风海流。

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But high-altitude wind currents forced their craft onto a more southerly course.

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He argued that the sea gets it iron from dust swept into the sea from the land, and that wind currents weren't carrying iron to HNLC areas.

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Without it, the boat can only sail downwind, putting the boat and her crew at the mercy of the wind and currents.

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