随着确保罗马边境安全所需资源的增加，罗马领导人之间就如何最好地保护罗马领土不受入侵部落的侵扰这一问题产生了严重的冲突。

As the resources needed to secure Rome's borders increased, serious conflicts developed among Roman leaders over how best to protect Roman territory against invading tribes.

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雨林有自己完善的系统来确保自身的生存；高大的树木有枝叶形成的树冠层来保护自身，树冠也保护着矮小的植物以及动物不受暴雨、酷暑及强风的侵扰。

Rainforests have their own perfect system for ensuring their own survival; the tall trees make a canopy of branches and leaves which protect themselves, smaller plants, and the forest animals from heavy rain, intense dry heat from the sun and strong winds.

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在城市里生活就无法避免受到交通噪声的侵扰。

Living in the city, you can't escape traffic noise.

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Millions of humans affected by Alzheimer's disease, other species don't get Alzheimer's disease.

上百万人受阿尔茨海默氏症的侵扰,其它物种并不会得这种病

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