human population的用法和樣例：
例句
- The birth rate is the number of births compared to the size of the population.
出牛率是出生人數與人口總數之比。 - That number is so small that even with the reduced child mortality which usually accompanies development it cannot possibly sustain the population.
這個數值非常低，即便隨著社會的發展，嬰兒死亡率已下降，如此低的出生率仍可能難以維持人口總數。
