In high summer, the bulls are fat from the rich grazing and in prime condition, but only a few will mate.

在盛夏，公野牛个个吃得胖乎乎的，精神焕发，然而只有为数不多的公牛会和母牛交配。

At some point, the core contracts and heats up so much that the conditions will finally be primed for helium fusion.

在某一时刻，核心会收缩和升温，最终为氦聚变提供了条件。

And here is the prime condition of success, the great secret: concentrate your energy, thought, and capital exclusively upon the business in which you are engaged.

把你的精力，思想和资本全都集中在你正从事的事业上。