Giving variables a data type, even with something as generic as xs: string, traps the unexpected absence of the attribute-something that has saved my day more often than I would like to admit.
为变量提供一个数据类型，可以是xs：string这样的一般类型，捕捉预计之外的属性缺失—这帮助我节约了大量时间。
Nil is the type of the special value nil and is used to represent the absence of a value.
nil是值为nil的一种特殊类型，用来表示没有值。
All of the above can be conditional upon the operating system type and revision, time of day, arbitrary user-defined classes, presence or absence of files, directories, or data in files, and so on.
上述所有这些根据操作系统类型和修订版本、一天中的时间、任意用户定义的类、文件中文件、目录或数据的有无等等可以是有条件的。
Similar to the malnutrition in urban children, this type of anemia is not caused by the absence of relevant food, but rather by poor eating habits and a lack of nutrition knowledge.
与大城市孩子营养不良问题有相似之处，这种贫血不是没有相应食物造成的，而与饮食习惯和营养知识缺乏有关。
RESULTS: Hemodynamics of CV could be divided into 4 types: high velocity type (27%), normal velocity type (22%), low velocity type (48%) and blood flow signal absence (2%).
结果：颈性眩晕血流动力学可分为4型：高流型(27%)、正流型(22%)、低流型(48%)、血流信号消失型(2%)。
The specified node does not support a resource of this type. This may be due to version inconsistencies or due to the absence of the resource DLL on this node.
指定的节点不支持这类资源，这也许是由于版本不一致或是由于在这个节点上没有资源DLL。
Analog Hall-Effect sensors are used to determine the presence or absence of magnets that identify the type of faceplate being used.
模拟霍尔效应传感器被用来确定磁铁存在或者不存在，从而确认所用的面板类型。
The results indicate the cation-modified spun silk can significantly improve the adsorbability of the K-type reactive dye, especially suitable for deep dyeing in the absence of salt.
结果表明，阳离子改性绢丝能显著提高对K型活性染料的吸附能力，尤其适用于染深浓色，而且染浴中不需加盐。
Our findings suggest that direct cell type conversion occurs via successive steps, and that dedifferentiation can occur in the absence of cell division.
我们的发现表明，细胞类型的直接转变是逐步完成的，而且这个去分化的过程能够在无细胞分裂的情况下发生。
Our findings suggest that direct cell type conversion occurs via successive steps, and that dedifferentiation can occur in the absence of cell division.
我们的发现表明，细胞类型的直接转变是逐步完成的，而且这个去分化的过程能够在无细胞分裂的情况下发生。
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