not both gate 与非门
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.
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。
Portal: A permanent Gate, allowing access to or from (not always both) a particular location.
传送门： 一道永久存在的门径，允许人来往于某个特定地点。
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