All new fashion starts out as a reaction against existing convention.

所有新时尚都是从反抗现存习俗开始的。

《柯林斯英汉双解大词典》

One is that, by convention, the Department of Justice is expected to appeal decisions that strike down existing law.

一个是，根据规定，司法部将会对与现行法律相抵触的判决进行裁决。

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Instead of explicitly adding a new storage area to an existing policy, you can use a naming convention for the storage areas that should be used with a given policy.

不必显式地将新的存储区域添加到已有策略，相反，可以根据用于给定策略的命名惯例为新的存储区域命名。

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The Protocol entered into force on January 6, 2011, following ratification by five parties to the existing Convention.

WHITEHOUSE: The White House

The existing Convention on Mutual Administrative Assistance in Tax Matters, done at Strasbourg on January 25, 1988, entered into force for the United States on January 4, 1995 (the "existing Convention").

WHITEHOUSE: The White House

Furthermore, it updates the existing Convention's rules regarding the confidentiality and permitted uses of exchanged tax information, and opens the existing Convention to adherence by countries other than OECD and Council of Europe members.

WHITEHOUSE: The White House