Such assistance was essential in identifying potential dangers—poisonous species, unpredictable rivers, uncharted territories—which could mean the difference between life and death.
这种援助对于查明潜在危险——有毒物种、不可预测的河流、未知领域——至关重要，那些危险可能意味着生死之差。
That attentiveness was one of the big effects of domestication, some scientists have argued, and a clear difference between the two species.
有的科学家认为，驯化过程中取得的最大成效就是我们培养了狗的这种注意力，这也是狼与狗最明显的区别之所在。
The difference of iron deficiency induced stress reaction between different plant genotypes open a broad prospect for selection and breading of high iron efficient plant species.
植物基因型之间对缺铁胁迫的这种反应上的差异，给铁高效基因型筛选和遗传育种工作提供了广阔的前景。
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