It was expected that the influence of social contexts on similarity in relationships would be stronger for weak relationships than for strong ones.

人们曾预计，在伴侣关系中，相比于牢固的伴侣关系，社交环境对相似性的影响对脆弱的伴侣关系的影响更大。

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Weak ones would be marginalised and maybe even killed in the cut and thrust of male competition.

ECONOMIST: The sex of a child may depend on how stressed its mother is