The primary force is the pupil premium, a scheme that channels extra money to schools with poorer pupils.

这一现象最主要的动力来自学生奖学金计划，这个计划把额外的钱拨给贫困学子。

This differential heating is the primary force behind wind creation.

这种差异加热是风力产生的主要力量。

In his book Man's Search for Meaning, Viktor Frankl argues that finding a meaning in life is our primary motivational force.

维克多·弗兰克尔在其《活出生命的意义》一书中指出，找寻生命的意义是我们的主要动力。

Thus, the  " mind" replaced the soul as the primary force behind human reason, cognition, and free will.

因此，“思想”取代了灵魂，成为人类理性、认知和自由意志背后的主要力量。

A Gravitational Tango The primary force driving tides is the gravity of the Moon and, to a lesser extent, the Sun.

引力探戈 驱动潮汐的主要力量是月球的引力，在较小程度上是太阳。

In fact, a 2009 study on the skulls of human ancestors found that social competition was a primary driving force for the evolution of human brains.

事实上，2009 年对人类祖先头骨的一项研究发现，社会竞争是人类大脑进化的主要驱动力。