两类国家的出生率和死亡率显著不同。

Both birth and death rates are strikingly different between the two groups of countries.

youdao

如果出生率和死亡率不随密度的变化而变换，则是非密度制约的。

Birth and death rates that do not change with density are density independent.

youdao

人类过去掉入高出生率和高死亡率的陷阱，而现在逃到了低出生率和低死亡率的自由之地。

Humanity was once caught in the trap of high fertility and high mortality.

youdao

人类过去掉入高出生率和高死亡率的陷阱，而现在逃到了低出生率和低死亡率的自由之地。

Humanity was once caught in the trap of high fertility and high mortality.

youdao