在试验中，他们构建了一个DNA版本的“异或”逻辑门，当两个输入端中有一个有输入时，产生输出；但当两个输入端都有或都没有输入时，就不会产生输出。
In tests, they modeled a DNA version of an XOR logic gate that generates an output when one of two inputs is present, but not when both or neither is present.
一般来说，服务器端的国际化仍然是一门艺术，而不是一项科学，它常常涉及一些专用的或用户自主开发的解决方案。
In general, internationalization of server-side applications is still an art rather than a science, often involving proprietary or roll-your-own solutions.
一个门只是一个消息，图形表示为一端连接序列图的框架边缘，另一端连接到生命线。
A gate is merely a message that is illustrated with one end connected to the sequence diagram's frame's edge and the other end connected to a lifeline.
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