冬季覆盖北美大部分地区的微弱高压。
A weak area of high surface pressure that covers most of North America in winter.
土壤微生物活度在水稻生长过程呈增加的趋势，前茬冬季覆盖作物区明显高于冬闲田。
The former-stubble crop treatments were higher amount of microbe than winter fallow stubble during early rice growth.
因此，虽然冬季海冰覆盖面积可能减少，但表层水将足够冰冷，因此海冰覆盖面积不会减少太多。
Thus, although the winter sea-ice cover might decrease, the surface waters would remain cold enough so that the decrease would not be excessive.
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