有且仅有人才有成为佛的可能。
在一个程序中，变量有且仅有一个定义。
There must be one and only one definition of a variable in a program.
该方法有且仅有两个参数。
有且仅有一只桶里有毒。
除了根以外，每一个房间有且仅有一个父级房间。
Besides the root, each house has one and only one parent house.
如果你想变的健康，有且仅有的方式，你必须外出工作并且正确饮食。
If you want to get healthier, there's only one way to do it, you have to become enticed by working-out and eating right.
你的目标就是声明一系列的方程，并且每个方程有且仅有一个可能的解决方法。
Your goal is to declare a series of equations that has one and only one possible solution.
另一个问题是通配符也允许userName，因此无法实现“有且仅有一个”的规则。
Yet another problem is that the wildcard also allows userName, so the "one and only one" rule cannot be enforced.
借助否定通配符(negative wildcard)，现在可以表示“有且仅有一个userName，但可以有任意多个任何其他元素”规则，如清单4所示。
With the help of the negative wildcard, you can now express the "one and only one userName and anything else" rule as in Listing 4.
例如，为了表示内容模型“有且仅有一个名为username的元素，但是可以有任意数量的任何其他元素，这些元素可以位于userName之前或之后”，可以定义如清单3中所示的内容模型。
For example, to express a content model for "one and only one element called userName and any number of any other elements, before or after userName", you define the content model as in Listing 3.
此外，元数据应当对一个（且仅有一个）WSDL文档有一个 wsrrtm_authoritativeWSDLs关系。
In addition, the metadata should have a wsrrtm_authoritativeWSDLs relationship to one and only one WSDL document.
吃花菜的话，有一种（且仅有一种）吃法不好。
多次心肌梗死组患者四年生存率仅有52，且死亡率随着时间的延长有增加趋势；
The all-cause mortality in 4 years was only 52% in the group of multiple MI and increased with time extending.
多次心肌梗死组患者四年生存率仅有52，且死亡率随着时间的延长有增加趋势；
The all-cause mortality in 4 years was only 52% in the group of multiple MI and increased with time extending.
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