Second, better living conditions leading to fewer deaths and a population explosion.

第二阶段，更好的生活条件，导致更少的死亡和人口激增。

It's growing wealth and dynamism has created an incredible population explosion in an already expanding city.

日增的财富与活力造成了这个已然膨胀的城市惊人的人口激增。

Before moving on here, quick reminder that cutting infant mortality does not lead to population explosions in the long run.

在继续之前，先提醒大家，从长远来看，降低婴儿死亡率并不会导致人口过剩。

What was shocking was the following day the E. coli experienced this population explosion.

令人震惊的是第二天大肠杆菌经历了种群爆炸。

A guaranteed abundant food source fuelled a sustained population explosion, and people began to live in large villages of between two or three hundred the highest concentration of people the world had yet seen.

这种很有保障的丰富食物来源成就了持续性的人口大爆炸，人们开始生活在两三百人组成的大村落里，这样的规模是史无前例的。