The heavier cloud cover to the north and west of this circular pattern was likely a response to a low-pressure system and to jet stream dynamics.

圆形的云型中，北部和西部云量更多，这可能是由于低压系统和急流的作用。

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This system is used to pump water into the core, low pressure safety injection and high pressure safety injection.

这个系统是用来将水抽到核心里去，降低压力安全加入和高压力，安全加入。

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Scattered showers and thunderstorms were also forecast for the Great Lakes region as a low pressure system moves south from Canada.

随着一个低压系统从加拿大向南移动，预计在五大湖地区也将出现散布各地的大雨和雷雨。

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When there is no wind, for example, heat builds up in a city, creating a low-pressure system that pulls air into the city.

CNN: In-Depth Specials - City Limits

The past two years it got stuck on top of southern England - and that locked a low-pressure system in place which in turn brought misery and rain.

BBC: Met Office cools summer forecast

Miles below, another low-pressure system is brewing.

CNN: The snows of Erukenya