It is during these seasons that the differences in temperature between warm and cold masses of air are greatest.

就在这些季节里，热气团与冷气团的温差最大。

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Without those masses of cooling sea ice, warm air brought to the Arctic can penetrate further inland than it ever did before.

如果没有这些大量冷却的海冰，被带到北极的暖空气可以比以前更深入渗透到内陆。

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The heatwave has been blamed on masses of hot air from the Sahara Desert moving north.

这场热浪归罪于从撒哈拉沙漠向北袭来的大量热空气。

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Every year,moist air masses known as monsoon produce large amounts of rainfall in India,East Asia, northern Australia and East Africa.

VOA: special.2010.05.25

Skeptics point out that global warming is expected to warm Arctic air masses more than Gulf of Mexico air masses, which will therefore diminish the contrast between the two air masses and reduce the strength and likelihood of tornadoes.

FORBES: Alarmists Offer A Perfect Global Warming Challenge

The 750 or so icebergs that break off from glaciers each year and drift south from Greenland are floating masses of freshwater ice formed in the pristine air of 3, 000 B.

FORBES: It's The Tap Of The Iceberg

The 750 or so icebergs that break off from glaciers each year and drift south from Greenland are floating masses of freshwater ice formed in the pristine air of 5, 000 years ago.

FORBES: It's The Tap Of The Iceberg