Only a handful of islands in the Southern Ocean are suitable for sustaining large breeding colonies.

南大洋中只有少数岛屿适合大型群落繁衍生存。

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Scientists don't know how large the Asian carp population would need to get before it becomes self-sustaining and morphs from nuisance into true threat.

科学家不清楚亚洲鲤鱼的种群规模达到多大时才能存活下来，并将骚扰变成真正的威胁。

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In short, the Sun's large-scale magnetic field is taken to be self-sustaining, so that the solar-activity cycle it drives would be maintained with little overall change for perhaps billions of years.

简单来说，就是太阳的巨大磁场被用来进行自我维持，所以，由其驱动的太阳活动周期将会在几十亿年的时间里维持整体上维持极小的变动。

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