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Smith said the crimson anthocyanin protects the delicate mechanisms that allow the tree to extract all the nutrients from its leaves.

史密斯说，深红色的花青素保护着微妙的机制，它让树木从叶子里提取所需要的全部营养物。

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The objective of SSO is to allow users access to all applications from one logon.

SSO的目标是，让用户能够通过一次登录访问所有应用程序。

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The new rules allow an escape from all this complexity and uncertainty.

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There have also been several cases of severe reprimands as people in court tweet or even text message from inside a court: we do not allow live reporting from a court room at all.

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Our challenge now is to allow all fifty states to benefit from the success of Race to the Top.

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