The contract can be terminated by either party with three months' notice.

合同的任何一方如提前三个月通知，均可终止本合同。

《牛津词典》

The election will decide if either party controls both houses of Congress.

这次选举将决定是否由任一党控制国会两院。

《柯林斯英汉双解大词典》

You may see a McCarthyite in either party.

你们可能在这个党，或者那个党里看到一个麦卡锡份子。

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It was a party of protest, formed by men who refused to support either of the two old parties.

VOA: special.2010.06.03

If there are additional ideas from either party, I'm happy to consider them, as well.

WHITEHOUSE: Creating Jobs Through New Small Business Initiatives

And by no means are these kinds of actions a monopoly of either party.

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But in most elections, that exasperation does not hurt or help either party disproportionately.

NPR: What Would It Take To Flip the House?