Zoos are at the forefront of conservation and constantly evolving to improve how they care for animals and protect each species in its natural habitat.

动物园处于动物保护的一线，其不断进步以改进照顾动物的方式，并在自然栖息地保护每一个物种。

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DA: Social norms are constantly evolving and they can tell us a lot about how and why people make decisions.

DA：社会规范在不断地演变，它可以告诉我们人们为什么和怎么做出决定。

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Designers use a constantly evolving visual language to suggest interactions.

设计师们在用不断进化的视觉语言来和用户互动。

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He says it is the web's first and only editorially controlled, interactive and constantly evolving book-building website.

BBC: Bloglines website

This emphasis on collaboration will simultaneously give our students the tools required to create new opportunities and thrive in fast-paced and constantly evolving global business environments.

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The FCC is trying to act quickly to keep the 911 system up to date with the constantly evolving cellphone industry--according to the commission, 14% of all adults now use cellphones as their only phones.

FORBES: Magazine Article