Do bear in mind, though, that at this time of year the weather is very changeable and if the cloud suddenly descends, it's all too easy to wander off the track.

但是要记住，每年的这个时候天气变化无常，如果乌云突然降落，就很容易偏离轨道。

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The build-up of energy and heat in Earth's system is important to track because of its bearing on current weather and future climate.

追踪地球系统中能量和热量的构成非常重要，因为这对于当前天气和未来气候都有重要影响。

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That means you can track weather patterns, storms (including scary ones like hurricanes), and watch them as they move across the map.

这意味着你可以通过在地图上移动，跟踪天气情况和暴风雨(包括可怕的飓风)情况。

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They may even track the weather and date to project when sales will be weakest or strongest.

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The boy's father, Richard Heene, apparently used the balloon to track the weather.

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In a statement, Royal Mail said it had done its best to keep deliveries on track but the weather had made an impact.

BBC: Apology after mail delays in Warwickshire