With no natural predators on the island, the herd increased rapidly.

由于岛上没有天然食肉动物，牧群的数量迅速增加。

《柯林斯英汉双解大词典》

With no natural predators and expanses of green suburban neighborhoods that allow no hunting, wildlife officials estimate the New Jersey deer population to have grown to exceed 175,000.

由于没有天敌，又有大片绿色的郊区禁止捕猎，野生动物官员估计，新泽西鹿的数量已经超过17.5万只。

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Natural predators are cheaper.

天然食肉动物更廉价。

youdao

Liu says the program helps West African farmers learn organic means of production using compost and natural predators.

VOA: standard.2010.04.11

With few natural predators, they are now listed as a "pest species" by Natural England.

BBC: Windermere's 'polluting' Canada geese to be culled

There could be as many as 2 million of the snakes on Guam, where they have no natural predators.

CNN: Deadly mice to rain down on Guam snakes

They have no natural predators and can reach lengths up to 18 feet.

CNN: Pythons elusive in first days of Florida hunt