冰点法: cryoscopic methodcryoscopyfreezing point methodfreezing-point method
冰点降低: deopression of freezing pointdepression of freezing pointdepression of the freezing pointfreezing point depressionfreezing point loweringfreezing point lowerringfreezing-point loweringice
It must work both at high altitudes where the temperature may be below freezing point and in the hot air of an airfield in the tropics . 它能在气温达冰点以下的高空工作，又能在热带地区机场的高温条件下工作。
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The gold and purple sunsets color the subfreezing waters of the arctic ocean 金色和紫色的夕阳把冰点以下的北冰洋水染成了五颜六色。
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During the first week in august the arctic sun dips below the horizon for the first time since may it has not set all summer long . the gold and purple sunsets color the subfreezing waters of the arctic ocean 8月的第一个星期，北极的太阳自5月以来第一次沉入地平线以下整个夏天太阳都没有落山。金色和紫色的夕阳把冰点以下的北冰洋水染成了五颜六色。
