Some uses of color in nature remain unknown, but one thing is for sure, color not only makes our planet beautiful but it is also necessary for our planet to live on.

颜色在自然界的一些用途仍然未知，但有一件事是肯定的，颜色不仅使我们的星球变得美丽，也是我们的星球得以生存的必要条件。

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Money, accessories, and popularity may be nice perks to enjoy, but they are not necessary to live a happy life.

也许金钱、首饰、名声是享受生活的附属品，但它们不是快乐生活的必需品。

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Regardless of your spiritual beliefs, purpose seems to be a necessary ingredient to live successfully.

不管你的精神信仰如何，目的似乎是人生成功的必要组成部分。

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All he tells us is that we are the polis animal by nature and that to achieve our ends, it will be necessary to live in a polis.

他只说到,我们是天生的城邦动物,为了达成目标，必需要住在城邦之中。

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The gap refers to the difference between state pension provision and the level of pension regarded as necessary to live on by the OECD.

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The reason being that jobs are not always created where people live: it is thus necessary for people to move, sometimes, to where the jobs are.

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The government said reforms were necessary because as people live longer the cost of funding public sector pensions was "unsustainable".

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