Covering indexes allow data storage within the index itself while sparse indexes exclude documents that do not contain the missing field.
Covered索引允许在索引本身里存储数据，而Sparse索引则会排除掉不包含索引字段的文档。
Sparse indexes boost performance when searching by a field that is often missing within a collection.
Sparse索引在所检索的字段并非经常出现在集合中时能提升性能。
In the data mining or machine learning field, a data preprocessing procedure is often needed to eliminate errors, noises, in-consistent data or missing data that are contained in the dataset.
在数据挖掘以及机器学习等领域，都需要涉及一个数据预处理过程，以消除数据中所包含的错误、噪声、不一致数据或缺失值。
Allow any chakras that are twisted or missing or too small or too large to be healed and come to balance, syncopating to the timing of the whole of your field.
允许任何扭曲的、缺失的、太小或太大的脉轮被疗愈和被平衡，切分你整体场的时间。
Any document that is missing the field is not indexed.
任何缺失的文档字段不是索引。
This exception is typically thrown when a field or method is deleted or renamed in one assembly, and the change is not reflected in a second assembly that is trying to access the missing member.
当一个程序集中的某个字段或方法被删除或重命名，而这一更改未反映在另一个尝试访问这个丢失的成员的程序集中时，通常会引发此异常。
Objective Correct MR line scan diffusion image with motion missing caused by patients motion and asymmetric magnetic field.
目的对在线扫描扩散成像法下由患者运动和磁场不均匀引起的MR图像运动缺失现象进行修正和补偿。
The stator cogging effect is usually ignored when we calculate generator magnetic field by air gap permeance method, which lead to the generator fault information missing.
采用气隙磁导法计算发电机磁场时通常忽略定子齿槽效应，漏掉了发电机的故障信息。
The stator cogging effect is usually ignored when we calculate generator magnetic field by air gap permeance method, which lead to the generator fault information missing.
采用气隙磁导法计算发电机磁场时通常忽略定子齿槽效应，漏掉了发电机的故障信息。
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