三是不稳定的空气状态。这是重要的局地热力条件。沙尘暴多发生于午后傍晚说明了局地热力条件的重要性。
Three is not stable air condition. This is an important local thermal conditions. Sandstorm occurs more often in the afternoon that incorporates the evening the importance of thermal condition.
稳定的空气，如果空气不稳定，气流会从山顶而不是侧面吹向山后并砸落地面，这时背风面存在强烈的下降乱流。
The stability of the air. If the air is unstable, the air may flow over the top of the hill instead of round the side, meaning that it will come crashing down in an area of sink behind the hill.
严重一点的患者可能就得用CPAP机来治疗了，人们给它取这个名字是因为它能够给气管提供稳定的空气压力，借以帮助患者在夜间呼吸。
More severe cases may be treated with a CPAP machine, so named because they maintain constant positive air pressure to the wind pipe to help users breathe easy at night.
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