The fertility rate is the number of children a woman can expect during her lifetime; 2.1 is the replacement level, the point at which the population stabilises.
人口出生率是指女性一生预期生养的儿童数目；2.1是更替水平，人口在这一点上保持稳定。
That number, the so-called replacement rate, is usually taken to be the level at which the population eventually stops growing.
1被称作是替换率，这通常被作为人口最终会停止增长的生育率水平。
The reason is that widening replacement-level fertility means population growth is slowing down anyway.
理由是生育等值交换水平的扩展表明人口增长不论怎样还是在减速。
Replacement rate — The level of total fertility that is compatible with a stationary population.
替换率——用来协调静止人口的总出生率级别。
Replacement rate — The level of total fertility that is compatible with a stationary population.
替换率——用来协调静止人口的总出生率级别。
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