Dr Norberg's work reinforces the point, and also shows that it is not formal marriage, but actual cohabitation, that is the decisive factor.

诺伯格博士的工作证实了这点，同时也表明决定因素并非正式婚姻，而是实际的同居。

youdao

It is a decisive factor in social progress.

教育是社会进步的决定性的因素。

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Learning motive plays a unique role in second language acquisition of learners and it is a decisive factor to predict the success of second language learning.

学习动机在学习者第二语言习得的过程中起着独特的作用，它是预测第二语言学习成功的一个决定性因素。

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National security will not be the decisive factor in whether Obama wins a second term, but it will influence swing voters who traditionally value stability over the uncertainty of new leadership.

FORBES: Obama Helping Voters Feel 'Secure'

But it would be sad if settling scores were the decisive factor in the outcome of a dispute where real issues are at stake, like the need to scrutinise the way all Western agencies do business with dictators.

ECONOMIST: America and the UN: A matter of honour | The

Obama carried North Carolina by only fourteen thousand votes and, many analysts say, must carry it again to win in 2012, so turnout could be a decisive factor.

NEWYORKER: State for Sale