It is found that the improved nine level model has a better simulations of the geopotential field, the temperature field and the precipitation field in winter and summer.

对比检验表明，改进后的九层模式对高度场、温度场及降水场的模拟均要优于原五层模式。

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In order that the crops in open field could survive safely the winter frost prevention operation is of Paramount importance.

为了使这些大田作物能够安全越冬，防霜作业具有极端重要意义。

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When the duration of surface snow cover is long and intensity of surface heating field is weakness in winter, the intensity of surface heating field is strong in next summer.

冬季地面积雪多的年份，地面加热场强度较弱，第二年夏季加热场强度则较强；

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Changes in the winter wind field broke up floating sea ice to create cracks that suggest the "opening of a Venetian blind, " said Dr Serreze.

BBC: Record ice loss in Arctic

But the appointment of Harris, who started his coaching career at Featherstone Rovers in 2009 before joining Noble at Crusaders last winter, now has responsibility for on-field affairs in his first top job.

BBC: Iestyn Harris replaces Brian Noble as Crusaders coach

Though the field sits in shallow water, this part of the Caspian freezes over in winter and fierce winds blow chunks of ice into the islands that the consortium has built to develop the field.

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