The spore morphology of Pteris is stable, and the difference between species is distinct , but the features of spore and sporophyte are not related.

凤尾蕨属植物孢子的形态稳定， 种间差异明显， 但孢子形态特征与孢子体的形态特征是不相关的。

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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。

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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。

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Or try buying yam and telling the seller you want a particular type when it is obvious to her you cannot tell the difference between the species.

BBC: Letter from Africa: Faking your fufu?

In only two species, robins and goldcrests, was there no discernible difference in size between the spleens of those pounced on by cats and those killed in collisions.

ECONOMIST: Survival of the fittest, and oldest