主要支配的影响是干冷气团之流入。
The major controlling influence is the inflow of a cold, dry, air mass .
就在这些季节里，热气团与冷气团的温差最大。
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。
It is during these seasons that the differences in temperature between warm and cold masses of air are greatest.
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