氮素动态调控时期由高产栽培常用的追肥时期或根据水稻群体状况与土壤矿质态氮浓度综合判断确定，追氮量由模型计算获得。

The time of dynamic nitrogen adjustment were determined by regular patterns or by the comprehensive evaluation of soil mineral nitrogen concentration and rice population status.

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乔布斯强调，经济不景气是否会影响苹果的销售，这还是一个很难确定的判断。

Jobs stressed that it was difficult to determine how the economic downturn would affect Apple's sales.

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您可以使用具体事例或者判断—确定每个元素的相关重要性—来进行比较。

You can do this using concrete facts or judgments - you are deciding each element's relative importance.

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First of all, it's really hard to figure out where everything is, where everything goes, making sure I'm in the right place.

第一，很难判断事务的位置,事物的走向，还有确定自己处于正确的位置。

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