either-or

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"It's not either-or in terms of genetics or environment," he says.
“对基因或者环境因素，这并不是非此即彼的单个选择，”他说。
Note that these command-line switches are case-insensitive and can be prefixed with either - or /.
值得注意的是所有这些命令行开关都是大小写敏感的，使用时请加上前缀-或/。
This semester, a student has the option of downloading a book as well — but it is an either-or choice: read online or download to a computer.
这学期，学生也可以选择下载一本书，但这是个非此即彼的选择：线上阅读或下载到电脑上。

Anti-slavery settlers in Kansas felt they could not get fair treatment from either the president or the new governor.
So either a potassium cyanide or sodium cyanide, these are used in synthesis in terms of making carbon-carbon bonds.
因此无论是氰化钾还是氰化钠，都被用来在合成过程中,制造碳碳键。
麻省理工公开课 - 化学原理课程节选
Fourth, there's generally some arrangement, either for the publication of the treaty, or its deposition, its safe-keeping in some sort of shrine.
第四是一些笼统的安排，对条约的公布，或者废除，然后放在圣坛里，安全保管。
耶鲁公开课 - 旧约导论课程节选

What most commentators are failing to note is that it is not an either-or situation.
FORBES: Move up http://i.forbesimg.com t Move down

used to refer to a situation in which there is a choice between two different plans of action, but both together are not possible